Am I the only one?

So I have had anal before. It took a lot of work and weeks maybe even months to lead up to actual anal. I never really enjoyed it so after my ex and I split up I was quite relieved that I wouldn't have someone asking me constantly to have some sort of anal play. Little Did I know there are men out there that have still not experienced it before and of course their curiosity gets the best of them. It's been several years since I have done it. Now everytime I have tried so that my SO could experience it I get absolutely nowhere near being able to. It hurts. And I mean it hurts a lot. Can't even get the tip in because it hurts so bad. And I remember how much I hate it and feel bad bc I know he's like to experience it and expect he's Gona try it again and I'll once again tell him to stop it. Am I the only one that hates it so much? Or experiences such a high level of pain barely trying at all? Is there something wrong with me? Help!