Of course you can. Welcome to the board, stick around awhile, it will help. You need a complete overhaul of how you look at the world. I'm not talking about changing your personality. I'm talking about gaining confidence, being secure in your own skin, and attitude.
From an outsider's perspective, your shyness and lack of confidence has caused a spiral in your life and caused you look at things much more negatively. We will change that.
The FIRST thing I think you should do, and again this is my opinion, is start getting in shape. Keep yourself looking sharp. Strive to reach your potential every day.