Finger or sex?!

So when my boyfriend fingers me he is amazing I finish every time and never last very long, we haven't had sex yet and I'm wondering if i can finish from finger penetration only with no other rubbing of the clit or anything, will I enjoy penetration during sex as well ? I know obviously a penis is a lot bigger than a couple of fingers but I'm just curious cause I know a lot of girls can't finish just from sex penetration alone ?