Question.

when I finger myself im not completely sure if im having an orgasim. When I am doing it I dont feel much of anything, but then it starts to feel really good, and I start to shake a little bit and then I feel like I have to quit and cant continue. Is...

this actually an orgasim?

Probably not. But i suggest going to www.the-clitoris.com, it has heaps of info on your parts and masterbation, you can learn alot, so you there when you get the chance.

I've had plenty of orgasms, and, trust me, you'll know when it happens. You lose control of yourself and get lost in the feeling.