Orgasms

Okay, I have a really easy time orgasming from clitoral stimulation, but I have never orgasmed from vaginal penetration. I have had various sexual partners, quite a few actually but have never been able to accomplish that. I don't know if I am doing it wrong or if they are or I am just different? It makes me sad because I feel like I will never be able to do it. Plus clitoral stimulation gets boring after a while. And on top of that I disappoint my boyfriend when I don't. So is that normal? Advice please!