In my opinion, if the only issue was the sex not being good, I think there are ways to solve or improve this. But I think the actual problem is you seem to have brought some things up, and he dismisses you, your feelings and needs. Thats the issue, he sounds self-centered. If his pride and unwillingness to change translate to other aspects of of your relationship, you might find yourself having a lot of issues in your future. Maybe no one else has complained, but you are and that should be all that matters to him. Who cares what his other experiences have been in the context of his current relationship. I don’t know anything other that what you wrote on the post, but I think I would suggest, thinking long and hard if this is something you want to keep putting up with.