I going to be direct and blunt with you: your phobias and various fears at least border on mental illness. You go to doctors and you don't believe what they say. You don't believe what anyone here says. You are pathologically obsessed with your body. And to what end? It leads to nothing but depression, unhappiness, and an inability to function.
If you had testicular cancer two years ago, you'd likely to be dead by now, as Lance Armstrong would have been had he not gotten aggressive treatment.
I have no idea how you're measuring your testicles, and centimeters is not a measure of weight. The usual method is to compare your testicles to a standard set of egg-shaped spheroids. The doctor then knows how big your testicles are based on the closest match.
You seem to be intelligent, if rather disturbed. You are very confused about a lot of medical issues. If I were of your mindset, I'd spend my life at a university medical library, and not rely on amateur advice from a Web site like this one. But if you think you know better than doctors, when you actually know nearly nothing of anatomy, physiology, or pathology, you are sadly deluded.
For instance, Accutane works by reducing sebum (skin oil) production, and seems to have anti-inflammatory properties. It does not "dry up hormones", whatever that means. It's a widely-prescribed drug. It can have serious side effects though, which you should and should have familiarized yourself with.
I don't take you at your word that you "do not produce much semen", because you didn't say how many milliliters of semen you typically produce, and there's no way you'd know what a normal amount is. How much semen you produce has little to do with fertility (go get a sperm count), and has nothing to do with erectile dysfunction. Erectile dysfunction means that you have difficulty getting and maintaining a good erection; it has nothing to to with ejaculation or volume of ejaculate.
In the past, you were wondering if you were gay because of the pitch of your voice and the shape of your waste. That's like wondering if you're Mexican because you have dark hair and you like tacos. The answer is that you are gay if you are sexually and emotionally attracted to men. But your issue there seemingly led to your leaving university. That issue had a serious impact on your life.
You desperately need to seek some kind of psychological counseling. No one can force you to do it, and there's no guarantee that it will fix your problems, but do you consider the current trajectory of your life to be acceptable?