If you grew up in an abusive home chances are you're a loner, and not comfortable in groups. Even if you're an extrovert, you're still a loner from what I've read about childhood abuse. If that's the case, you need to realize you'll probably never be comfortable in groups.

As for people not liking you, don't project stuff onto other people unless you know for sure they feel that way. Most people are so involved in their own lives that they barely notice anyone but their closest friends and family. For most people their three favorite people are me, myself and I.