I've never achieved orgasm during sex

I don't know if it's normal or not, but I haven't had a partner that has made me cum before. I usually masturbate with my legs closed and on my back, so I don't know if having an orgasm is difficult for me because I do it the same way every time or not. Sometimes the sex will feel ok, and I'll contract a little bit, but I've never had an orgasm with a partner and I really want to so if anyone has any tips or anything let me know