What steps do I need to take to change my ways?

Sit down with yourself and really confront the reasoning behind it. Ask yourself:

1. Okay, am I doing this just to get attention? Am I pushing people away because I WANT them to come after me?

If yes, then see a professional therapist who will be able to offer better advice than anything I could tell you on Yahoo Answers. And who will also be able to analyze the problem to a more thorough degree.

If no, ask yourself:
2. Am I doing this because of something that happened in my past? Is there something that I'm not letting myself remember?

If yes, you could be a sufferer of repression. Something traumatic (read: horrifying and/or bad) may have happened to you in the past. Repression is a defense mechanism. To protect your conscience mind from the immediate psychological damage the traumatic event could have had at the time, your conscience mind chose to shove to the back of your mind, where the event remains un-confronted on a subconscious level. The event does not necessarily have to be very traumatic (such as some form of abuse) -- it could be as simple as a comment said by a friend (or a stranger) in passing in regard to you and a boy. Maybe in preschool, you had a crush on the boy across the room, and a friend found out and made fun of you. Even if you're no longer friends with that person, the event still bothered you enough that the memory got repressed and it still affects you to this day. Depending on the level of seriousness of the memory, I still suggest you see a therapist.

If no, ask yourself:
3. Who am I trying to get close to? Is it just friends I'm having trouble with, or is it my family too?

If you're just having trouble with a friend, or a boyfriend, chances are that you're having what's considered normal "angst." Angst is defined as very angry or very sad thoughts. Angst does not make you a "goth" or "emo." Angst is a normal emotion, experienced by everyone at some point or another, and often not immediately confronted. It's a phase we all go through. Right now, you're kind of depressed. You feel lonely. So you're beginning to wonder if there's something seriously wrong with your character or personality that's pushing people away. Chances are, there's nothing wrong with your character or personality. It just feels like there is simply because: People change. Not everyone who is your friend now is going to be your friend later, but you learn to make new friends has time goes on.

If the problem extends to the feeling that you feel isolated from your family as well as your friends, (repetitive as this is beginning to sound) -- see a therapist. This is a sign of a more serious disorder.

I hope everything works out for you! Good luck!

To do something valuable to yourself and others.
Be positive to your thinkings and actions .

There is a good movie for you .

http://tw.youtube.com/watch?v=_b1GKGWJbE8