Why can’t I feel pretty?

So lately i’ve been having lots of low self esteem. But the issue is I only know how to look good when i’m taking photos or showing off my body. I had a situation where my boyfriend asked me for photos and I said sure. But he mentioned he wanted “cute” photos for his background. While I was taking the photos it was a bit challenging cause I wasn’t showing my body. I had to take cute photos of my face and covered up body. I felt the ugliest I have ever felt. My face just didn’t look right or anything about the pictures or me. My boyfriend comforted me and reassured me lots to help that he doesn’t just want my body but rather the whole me. My past relationships have been where the guy wants just me body so i’ll say that kinda stuck with me. I have an amazing boyfriend now and i’m so grateful for him. But why do I do this? I only feel pretty when i’m taking sexy pictures but when I take selfies or pictures of me covered up I feel hideous? Any tips on being more confident being just me?