I'd been experiencing smaller, less intense orgasms a lot, but I never quite realized that's what it was? Probably because they were sort of underwhelming, and also, as a girl with a vagina and all that, I'd never really learned about what an orgasm feels like/looks like/etc for someone who DOESN'T have a penis.
But then I got my first vibrator and after I got used to it... wow!!! I remember lying in bed like oh my god this is the best thing ever!!!