Help me please!I am a young woman who can't orgasm during sex!Why can't I?

[Michelle]

I'm a young girl who can't achieve an orgasm during sex. I can have orgasms when I play or (masturbate) for myself.I use like a massage thing or the shower head.I use to use my hand but it doesn't work anymore.!!LOL!(played out Right)Well anyways I can't get an orgasm during sex! Me and my boyfriend do oral and its like it feels great but I still can't even achieve it then and i would think that would be the best way! When we have sex it feels good and I can feel my boyfriend when he's in me but then the feeling kind of disappears after while unless he does it harder but I just don't feel when I get ready to let go!He says I been done it because he can feel it when I do but I don't!When I ride him for a while its like a watery liquid be left on him but I don't never know what it is!!The first time I thought I had peed on him but the next time I made sure I went to the restroom before and its still happened so I don't know what it is!SO am I having an orgasm and just don't know it or I'm not having orgasms and if not how can I achieve them?