Aren't We Family ?

My sister is really popular and everyone adores her at school; where’s it’s the opposite with me I was bullied a lot throughout the past couple of years and what hurt the most was that the bullies were my friends.... and my sister would always hang out with them even though she knew what they were doing to me. They would tease me push me around follow me and act like I was stalking them. It even came to the point where they started body shaming me. We’re supposedly fine now (me and my so-called friends) but I still can’t get it out of my system that my own friends that I had known for three years body shamed me.... they don’t do it anymore, but they still talk about me behind my back and it makes me feel like a freak, pls give me some advice