Masturbation

Alex
Hey... So I'm pretty young... Much younger than the age I put in. Despite that, like many younger girls out there, I masturbate. I've always been scared to reach an orgasm, and whenever I tried to, I always got a tummy ache. So, I have a couple questions. How do orgasms feel? Are they painful? Should I really be scared of them? Along with that, what would be an easy masturbation technique? I don't have much at home, no dildos or vibrators or anything. 
Thanks, 
Alex