Hi girls i need some advice

Ive been dating my boyfriend for a while

But i cant help but feel tense during sex sometimes, like i have trouble spreading my legs even though im flexible, sometimes i cant its as if something’s bothering me

I always enjoy the sex though still feels amazing but i still have this weird tension holding me back from being far better and i don’t know how to stop it, i also have trouble letting him finger me, i dont know how to fix it, i want to like it but i dont know how, if any of you got some tips i am all ears!!!!