Making sex more enjoyable

Hey guys! So I've been with my boyfriend for almost two years, and we've been having sex for almost a year now. My boyfriend is pretty well endowed, so penetrative sex can get pretty painful for me- especially at first. As much as I like having sex, I've never really found it to be very physically enjoyable. We've been experimenting with different positions to try to find one feels good to me, but so far we've only found one, but it's not enjoyable enough to make me finish, and he gets tired in that position pretty quickly. Do you guys have any tips to make it more enjoyable so we both are able to physically enjoy each other?