I can never cum during intercourse. The only way I can cum is by oral sex or masturbastion. Is there something wrong with me?
no there is nothing wrong with you, some people in fact have the reverse situation. it could be psychological (as tends to be the case when men can't ejaculate from oral sex), where you don't feel comfortable with ejaculating during sex. perhaps you could try other positions or motions as maybe what you're currently doing isn't working for you. does your partner know how to clench her vaginal muscles? that could help.
as an afterthought, do you use condoms?
as an afterthought, do you use condoms?