Anal sex

I tried anal sex for the first time last night with my boyfriend. He loved it, and it wasn't unpleasant for me but it felt like I was pooping the whole time lol. Which I know I'm not, but it's still not a great feeling. So I'm wondering if that feeling will ever go away or at least lessen? I had to keep asking for a break because it's just a really weird feeling. Also any other tips to make it more enjoyable? Thank you!