NEED ADVICE!!

When I was nine my thirteen year old cousin would make me take my clothes off and he would start touching me say things that made me feel bad about myself. My parents had caught him and got me into therapy(Didn't help, dealing with major depression). I'm fourteen now and I'm still very insecure. When I was 12 a kid would start feeling on me and using sweet talk in front of the people in the back of my bus and they all encouraged it😭. I know it's dumb, but I'm having a hard time with relationships, and I've missed out on some good ones because I'm so insecure and mistrustful. It seems like I'm always having constant issues and sometimes I think about giving up. I don't talk to people about how I feel and I have so much balled up inside, I really need some advice!