I realized I was similarly getting manipulated and teased in my late teens. Looking back, I think alot of it was down to me missing/misinterpreting social signals and trying to fit in. I was usually aware of what was going on but didn't know how to extricate myself in a way that wouldn't bring further ridicule.
Once I became aware of the pattern, I stopped talking to and approaching people. I keep to myself and generally approach social situations from a respectful but hostile and mistrustful position until proven otherwise. I'm trying to break this habit but its difficult after living it for so long.