Difficulty having Sex

Aubrey
When I'm having sex it is often hard for me to get wet, and hard for me to stay in positions. I am pretty tight and he's slightly above average in both size and girth. I've found that it's not possible for me to have doggy whatsoever because it's painful and there's always a popping sound in my pelvis (I have no idea what it is) other positions are okay but anything that involves flexiblity such as missionary with my legs held up my legs automatically start shutting like even if I'm holding my legs or he is holding my legs they start to close. (But I can do yoga without problem wtf) It is so frustrating and It makes me feel sexually inneficient. Am I the only one with this problem?