Squirt or Orgasm?

I'm 17 and me my boyfriend have sex at least 3 times a week, somehow even after all the times we've done it, I'm stil confused. I don't understand if squirting is the same thing as an orgasm. Sometimes when he touches my g spot I just get this sensation that I want to like pee and my legs start shaking. But I really don't understand if there the same thing? Can anyone help?