Every day you have a choice, to dwell on the bad, or look for the good. If life has you down to the point you feel it isn't worth living it's time to go get help from a therapist or Dr. I myself recently decided I'd been trying to feel better on my own for long enough, and got help for my depression. Life is too wonderful to waste it feeling awful about what might have been or what isn't! I hope you can believe that YOU ARE WORTH IT, and you deserve to have true happiness.