If you feel that you have genuinely ruined your life, you might be wondering whether you can just start again with a blank slate. In some respects, yes you can. You can change all the circumstances of your life and try to start afresh.
The key is that this has to include your mindset if your new life is to work out better than your current one. You cannot take a lack of self-esteem and self-confidence with you and expect to forge a beautiful new life that somehow cures these things. The same goes for mental health issues too.