Never Orgasmed :(

I just want to feel good having sex!  I have had two sexual partners since I was 16 and didn't reach orgasm with either of them, in fact it felt like nothing! :(  I have been with my boyfriend for 3 years now and love him to death but I want to feel good when we are having sex!  I can have a clitoral orgasm but never a vaginal.  Does anyone have any tips on how to have a great orgasm or just feel something?