IIN to be anal only?

It's hilarious how some religious girls believe that only penis-in-vagina sex is "real" sex, so they could bang away with a dick up their ass ten times a day for ten years and still be "chaste" as far as Jesus is concerned. They must believe He and His Daddy are total idiots.

There's nothing wrong with enjoying anal sex, and you're not weird for preferring it over vaginal. The clitoris is a lot larger than just the little nub at the front of the vulva, and the internal anatomy of some women allows them to get a great deal of pleasure from anal.

The "dirtiness" of anal and it being taboo is also often a significant factor.

In your case, it sounds like you happen to have the anatomy that allows you to enjoy it, something about what's going on in your head makes it highly erotic to you, your boyfriend must have been the sort of guy who introduced you to anal in a way that allowed you to enjoy it, and because it was your first penetrative sex, you sort of trained yourself to see it as the best sex.

Something many people don't know is that only around a fifth of women are capable of reaching orgasm through penis-in-vagina thrusting alone, so it's not really surprising that you find PIV sex underwhelming.

The only thing that matters is that you and your boyfriend both enjoy what you're doing for each other. What others think about your preferences is irrelevant. However, you can be certain that you're not unique.