Friend jokes about my appearance...

So theres this girl I’ve been friends with for almost six years now we consider each other best friends. So when it comes to my appearance I am very sensitive about it. She sometimes jokes about my insecurities and I know she might just be joking but that shit kinda hurts. I also consider her being prettier than me she’s the more confident one with more money meaning more clothes. I don’t really know what to do in this situation...