I need help!!

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Every time I take a piss it really huts. Its hard to explains. Its like the insides are getting cut or something. And another question is, if you can pre-cum (the white stuff) does than mean you can cum too? Or just because you can pre-cum doesnt mean you can cum.

need a few more detials realy but it sounds a bit like an STD, but that is only if you have had sex lately. You might as well go to your doc and describe to him whats happening, he will probably prescribe you something. He might want to take a look, thats the bit that always makes me think twice about going to the doctors. How old are you? because i remember a few years ago when i was about 14 i used to get a small burning sensation when i took a pee. It went away after a few months so i just assumed it was part of growing up.

To answer your second question: Precum is not white, its clear. Its totally different from regular cum, which is often whitish colored when its fully developed.
Precum is produced by the Cowper's Glands near the base of the penis, and precum oozes out whenever you are aroused and turned on, BEFORE you get even close to orgasm and ejaculation of regular cum. There's usually no sensation with precum - it just oozes out without much feeling. Precum is 100% clear and sticky, but slippery.
A lot of times boys going through puberty get confused with regular cum and precum, because often the first signs of regular cum is clear, not white, just like precum, and they think that's precum. First ejaculations are often clear because not all the components of regular adult-type semen are developed yet. So early ejaculations during puberty are often thought to be precum because they are sometimes clear. But its not, its regular cum, just not fully developed yet.
Here's how to tell the difference between regular clear cum and precum: Clear cum will only squirt out during orgasm as an ejaculation - its the same as a fully mature ejaculation, only its clear, not white. It will turn more whitish and thicker as puberty progresses. Precum oozes out well before you get to orgasm with little to no sensation, a drop or two at a time. Precum does not squirt out, and does not usually come out with orgasm.
Also, keep in mind, that not all guys get precum - only some do, and its normal either way.

It seems from your cum question that you are not sexually active, so an STD is probably not the source of your pain. Most likely it is a urinary tract infection (UTI). A doctor wuold take a urine sample and prescribe antibiotics as tratment.

Yea it couldnt be a STD because in still 14. But I will for sure go to a doctor or something. Because unlike the person in the beginning, its been happening for almost 4 years. O yea and thx for the help .

Heavens, four years! Get yourself to a doctor!