Find someone who will help guide you to where you want to go, find someone who believes in you and will help you move past your faults. Find someone who will help you not waste your time, someone who will help you become who you're meant to be.
You still have time. You’re not too old, you haven’t spent your final chance. I personally don't think you have to be sad to write a sad song though. It is true that in the hardest times of our lives we come up with some of the best stuff to write.