Sometimes when in really horny, i wanna masturbate but maybe can't or don't wanna, my penis sometimes hurts as if my erection is to big or something, is this normal?
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Sore erections
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If you have been aroused for awhile with no ejaculation, it is common to experience an ache in the groin commonly known as "blue balls"
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I think it is normal, but I would recommend you to go to the doctor.
Also you can check this article http://potencyup.com/can-masturbation-cause-erectile-dysfunction/ about masturbation and some myths about it.
Anyway, if you were horny quite long time it could be a reason of our pain.