what is a female orgasm actually like?

I'm F20 and I'm unsure if i've ever experienced an orgasm. I've had people describe it as a release and you go all shakey. I've been dating my bf M22 for a year and, although it's pleasurable, I haven't been able to get the big "finish", even just by myself.

I know there's different types, and I believe the clit orgasm is the biggest one. I thinkk Ive had the g-spot one as I have been able to "squirt", for lack of a more pleasant word.

Basically, I'm just wondering have I already experienced it and didn't know? Or am I mentally preventing myself because of the pressure to finish?