I (26F) have been friends with Lily (27F) for years. Recently, she got engaged and asked me to be a bridesmaid. However, she started making comments about how I should look, including jabs at my appearance and style. A few weeks ago, she told me I wasn’t "thin enough" for the dress she chose, which really upset me. When I tried to talk to her about it, she brushed it off as a joke. I decided I didn’t want to be in the wedding anymore, and now she’s mad at me, saying I’m being selfish.

AITA for backing out?