Don't waste your time thinking about what could have happened. You already know that life's a bitch, although you have found it out the hardest way.
Try to smile, everyday. Don't let your tears drop like rainfalls. Don't think about you've lost. Don't cry. Because each part of your life has happened because of something, has happened to build you up as a person. Life consists in stumble, fall down one time and another and stand up stronger and wiser, because you'll learn from your mistakes.
Life's only one, and it's rather short to waste it regretting yourself. Enjoy your life and don't look back.
"Y nunca pierdas tu sonrisa"