Orgasms? whats that?

Ladies, Ladies, Ladies... i am 22 years old and girlll, i haven't experienced not even one orgasm with any of my 5 former partners during the year. How do i know when i cum or when i have an orgasm? I've read and seen documentaries about it, tried exploring my body a little, and nothing (so you know, i can't please myslef, masturbation just really isn't my thing.). So how can i get pleased at the extent to orgasm or cum if i don't even know my own body?