Hi buddies Im 15 I mostly masterbute but I dont let sperms come out from ma penis but it hurts me?

I assume your testicles hurt. You will experience testicle pain if you don't ejaculate your semen (boys call this pain "blue balls"). There is nothing dangerous or shameful about ejaculating, so you should definitely let yourself orgasm. Otherwise, you will ejaculate semen in your sleep. Remember, your body does not stop making semen even if you don't let it ejaculate. It will come out, so let it come out on a regular basis.