If you constantly ask who you are, you will never really find out. As most things in life actions are the way forward. I take a chance everyday- I call it process of elimination. Try everything until you are left with what your passion is.
As for being alone, hon you can never be alone as you are in my thoughts. If you can find one thing, just one thing to be proud of that you have achieved, you are probably doing better than most. The world has become bitter and cold, but since you have but one go, be grateful that you have made a positive mark (no matter how small) and most importantly remember somewhere, someone loves you very much and always will