Contrary to one of the other answers, I don't think this is a stupid or silly question at all. It's just not very easy to answer in a Yahoo! Answer forum.
"Reinventing" yourself - despite all the press and media attention (i.e., Madonna "reinventing" herself - which is really just another variation on the theme of her public persona, which has NOTHING to do with her real private inner life) - shouldn't be construed as a complete abandonment of everything that has defined you up to this point in your life.
Over your life, you've developed a set of ethics and values, a feel for what is important to you and what is not, what really gets your motor running and what you could live without. Also, you know if you are a person of faith, an atheist, etc...and you can't snap your fingers and suddenly decide to not believe in God...or believe in God...just because there are lots of things about your current life you dislike.
I'd start by assessing what you're unhappy about - and separate them into two categories - 1) things about yourself, especially how you respond to things around you (circumstances, events, other people, etc.) and, 2) the things around you themselves.
See, first thing to realize is you aren't responsble for other people, and a large percentage of the circumstances of everyday life. But the second thing to realize and own is that you ARE responsble for your response to those things, and everything else in your direct control.
Feel you're settling for what's comfortable? YOU have to volitionally commit to setting a standard and continuing to pursue it in the face of mediocrity. Not happy with the people you're with? WHY? Because of they way they act? (which you can't control) Or because of the way you respond to them? (which you CAN and SHOULD control).
Do you need to be more aggressive, assertive and driven? Do you need to be more passionately committed to your life?
See, only YOU can answer those questions - and no one on Yahoo! Answers can do that for you.
Bottom line? The answer to your question lies in your own decision to ask all of us strangers about it.
You reinvent yourself by taking control and accountability for your own life, no excuses, and stop relying on others to point the way for you.
Hope this helps. Best to you.