Relationships

So at the old age of 25, I still don't think I am ready to have a relationship. I think I am so set in my ways that there is no way I would let someone into my life to kinda of mess with what I like to do. I just don't think I am meant to have a serious monogamous relationship. I start getting close with people and then start puching them away and avoiding them. I have never really been like this before. In college, I was always the one chasing guys and always wanted a relationship and was extremley needy. But now I just push people away when I feel like they are getting to close. I think I am just scared and I make bad choices.