You are the average of your five closest friends. Seriously, think about that. Think back on the worst times in your life...the ones where you were either bad, or just mischievous. The group of people you hung out with was likely different than the group you associate with now...assuming you've made a turn for the better.
IF you want to improve yourself, you need to find a solid, core group of people to help.
Starting tomorrow, I'll tell you about the three kind of people that you NEED in your life IF you're looking for change. I refer to them as The Hammer, The Heat, and The Water.