Every day when I get home, I masturbate. I've even masturbated at school in the boys' bathroom. Is there any way I could get HIV from masturbating?
Absolutely not. The virus lives in bodily fluids (notably blood and semen) and cannot survive for long when exposed to air. The only possible way you could get HIV from masturbating was if you had cuts or scratches on your penis and got someone else's semen or blood onto it.