Question for bottoms and verses

So typically in the bedroom I am a top, but whenever the other person takes on a more dominant attitude I tend to get the urge to bottom. The issue is I don’t really find bottoming to be pleasurable even though I really want it, I enjoy the intimacy and there are moments of pleasure but I typically only feel tightness and even a bit of pain.

What are tips to help me relax or find enjoyment in bottoming past the intimacy because sometimes it hurts so much or is so tight me and the other party will have to swap roles.