Here's a great song I listen to whenever I'm feeling this way. Helps me put things in perspective and continue to move on.
Leaving the Past by Immortal Technique
https://www.youtube.com/watch?v=9Y4r3aFMxdU
Some really great lines in the song.
"Hell is not a place you go if you're not a Christian / it's the failure of your life's greatest ambition"
"I freestyle my destiny / it's not written in pages"
"On my business card I am a corporate president. In my mind I am a game developer. But in my heart I am a gamer." - Satoru Iwata