looking at other guys nude bodies is perfectly normal. It is a part of human nature that we are all curious about ourselves and each other and everythign else inthe world and beyond.
another part of human nature is we are all prone to seeking some form of acceptance from others as well, so showering in a locker room is a way to fill that basic human need.
So, feel free to take a look and don;t give that part a second thought. What you need to work on is your own self-image to the point where you can shower too thus being clean when you depart the locker room after PE so you don't stink up the school...
shaving is fine as long as you like the effect. my roommate shaves his pubes for much the same reason as you. also he finds when he uses a condom and hasn't shaved, his pubes seem to catch when he takes it off so another good reason to shave.
so don't even waste time worrying about what anyone else will think if they see you keep your pubic hair well trimmed or closely shaved. It is your pubic hair and you can darn well do what you like with it - shave, trim, due it purple even. Just know tha tyou like it the way you have it and anyone who puts you down or questions your shaving can just go hide in a corner and play with themselves.
Sounds like the foreskin is still adhered to the glans a little near where the glans meets the shaft. While this adhesion usually disappears naturally before age 14 or so, it isn't uncommon for it to persist a while longer especially if your self pleasures don't involve retracting as far as possible.
best cure is to keep retracting your foreskin as far as it will go easily then just a wee bit further; but only to the point of discomfort not pain. After a few weeks the adhesion will gradually let go and all will be well.
semen is produced and only survives within a narrow temperature range. Your scrotum loosens and contracts constantly to adjust the temperature to keep it within the desired range. Also, men who wear tight underwear often have low sperm counts since they are keeping their testicles close to their body all the time and the temperature is too high.
Thus once sperm departs the body (without going into a warm area) and is exposed to cool temperatures (and normal room temperature feels cold to sperm) it basically drops dead within minutes. So whether it is in your underwear or on your pants, once you remove them and they in a laundry basket (or on the flooor for those who are not neat about where they throw their clothes) for a while there is not a hope in heck of the sprem surviving for long.
Add in the varied temperatures used to do laundry (from cold to hot water and the heat of the dryer) plus the detergents and you can be pretty sure not much (whether it be sperm, STD's or even insects) will survive under such conditions.
actually the skin at the base of the penis shaft is not any different from the skin on your belly thus it should not be any more sensitive. However, other parts like the glans are definitely not areas where one would want to apply chemical hair removers.
Key is to try just a little and see. If it irritates then wash it off and check out other brands or go back to shaving.
Remember most hair removal products are targetted toward females and there might be a higher risk of the cream entering into sensitive areas on them than on men given the hair they might want to remove is a whole lot closer to the super sensitive parts than it is on guys.
But overall, you are correct; use of a hair removal cream on the genital area is not something one should do lightly.
What you are experiencing is a pretty common phenomena; retracting when getting an erection and remaining retracted once the erection subsides. And yes, an exposed glans can be kind of uncomfortable rubbing against fabrics.
One thing to do is avoid your girlfriend when in a situation where you cannot easily restore the foreskin to it's proper position after. But that suggestion probably isn't very practical.
Another solution is to head to the men's room or a closet or somewhere that offers a bit of privacy so you can fiddle a little to set things to rights. Even standing by your open locker door with your gf on the other side should prevent anyone from noticing. Although I won't guarantee that having your gf that close while you fiddle with things won't result in another erection.
The other alternative is to learn how to get a hand down into one pocket and discretely pull the foreskin back to it's normal resting position. Just face away from the crowd as you do it. Oh, and if you can't quite get a griop on things through the pocket, simply remove the stitches that hold the bottom of the pocket together (which your gf will love next time she wants to play pickpocket - hehe).
Though over time, your glans will lose a bit of the super-sensitivity now that it can be exposed. So, as the old saying goes, time heals all.
Shaving is the primary option but people have used hair removal creams with success. they not only remove the hair but they do a good job of eliminating the stubble. Of course waxing is used for hair removal but unless you are into a little S&M (or your partner is - hehe) you might not want to give a go at them.
For the creams, follow directions carefully and watch for signs of irritation. If one causes you trouble, try a different brand. Main thing is to not get too sloppy when applying it lest the cream winds up removing half your pubic hair or it gets on the head which can be really uncomfortable.
and others ...
all possible causes for losing the desire and/or the erection before getting there. Before you can fix the problem you need to determine the cause(s) and then work on the one(s) that are causing you to not do it.
One thing to keep in mind, since the problem exists, you are now worrying about it and that worry can make it worse. So first thing I woudl do is talk to her and take the sexual activity (other than necking, petting and general fooling around) out of the scene for a while. Spend more time doign movies or sports events or just walking through the park and less time trying to get it. Yep, not easy but it can help.
Once you have that stress gone, then you can look at the rest of the possible causes and set to work eliminating them.
Always get lots of sleep,
avoid masturbation (well a little won't hurt but cut it down to once or twice a week),
work on getting yourself toned up,
if school or work or whatever is adding stress to your life, see what can be done to reduce that source,
and of course stepping back from the sexual action will give you a little time to figure out if this particular partner is really doing it for you in all ways possible.
probably no one thing is going to cure your problem but effort on several fronts should do the trick.