I don't know what to say. If you really aren't enjoying youself, and you feel that you made a big mistake than I would consider dropping out.
It's never too late to rejoin. Take some time away, and see how you feel. If you feel you did infact make a mistake, join the sisterhood again in the future.
But if you feel that maybe you can actually see yourself being sisters with these girls, and having a good time enjoying yourself than stay with it.
Time flies when you're having fun, so make the most of it!
