Sex doesn’t feel good

I’ve been sexually active for 2 years w/my fiancé. He’s average size. Not huge, not little. When we have sex it doesn’t hurt, but it also doesn’t feel good. We’ve done a lot of positions. When we’re having sex it just feels like there’s something in my vagina (I mean obviously) but there’s no pleasure to it. I would rather him finger me cause it feels sm better. Does anyone have an idea as to why? Or how to help it?