what to do what to do

First I am very confident and more than most 20 year old girls. I usually don't care what people think about me but I know my bf friends hate me. Why? 1. They claim I have cheated on my bf. Why I have no idea they met me once at a party and everyone was drunk. 2. They don't like what I wear. I was wearing a body on dress that fit me perfectly and covered my butt. But I got a butt like Kim kardashian and boobs also. The dress I wore on my friend who has no curves but taller fit her perfectly and on me it fit my body. I can't control my shape and am fit just curvy. Well my bf wants me to come to their party in 2 weeks and I would have to fly since we are long distance. Do I go or not? I just feel so scared of what they are going to say. But I want to look good and feel good. Trust me I'm not a cheater or dress provactively. All these guys have sex with every girl they meet. My bf and I have been together over two years and are waiting. I have values and ik his friends don't matter I just don't know if I can emotionally be strong. Last time I heard girls talking about me and I told my bf and he did the typical you are jealous. I wish I stood up to these people and called them out for talking about me as I am in ear shots away. I want to be with my boyfriend and have fun but I want to be able to enjoy myself and didn't last year. My bf wasnt with me when the girls were taking so i couldn't tel him to say something. I'm already scared and haven't even said yes to going. Can I wear a bodycon? I'm 20 and curvy.  Like I said I have a kim kardashian body and guys drool over her yet I get mocked for wearing a dress! Ugh I'm so upset still. I hate his friends