should i stay where i am? or go back?

I'm a junior in high school right now, and I've never really liked the place I live. Two years ago [freshman year], about halfway through the year I couldn't take it anymore and moved in with my cousin who is the same age and went to school in her town for the remainder of my year. However, at the time, there were 5 kids going to one high school and space was cramped. I was also more immature than I am now, so I hated living there. I loved going to school though, it was absolutely fantastic. I ended up just going back to where I live because it became difficult living there, and I certainly wasn't going to last 4 years. So I went to my school sophomore and junior year, and I'm really beginning to feel the same way I did before. I jokingly mentioned returning to my cousins town, and she was all for it. Next year, it would only be she and I, and her [soon to be] freshman brother. She now has her license, and we've both grown a lot as people. I have remained friends with those I made 2 years ago, too. So, I may want to go back. My problem is, though, that it IS my senior year, and I'm not sure if I want to abandon those I do actually love here. Such as my twin brother. I'm completely on the fence, I have no clue what to do.