Dick too big?

So I lost my viriginity to my bf about 2 months ago. Keep in mind he's almost 8" and very thick, he's also 6'2. I'm 5'1. It's almost impossible to orgasm when we have sex. He always cums but even when either of us rub my clit while he's in there, I still don't orgasm. I think it's because he's too big. I've orgasmed probably 3 times in about 15 times that we've had sex. I also don't cum from oral, it feels good but not good enought to cum. We've done missionary, doggy, me on top, and one where hes on his side and I'm on my back, idk what its called. The one time I've came from him just being inside me is when we were doing it missionary and he was pressed on me and his pubic area was rubbing on my clit. I just wish it wasn't so difficult because I usually don't feel satisfied after sex. Also, he's 21, I'm 20.