You and I are, by birth, by nature, and by choice, inwardly depraved, which is to say that we are entirely corrupt. That's not to say that we have no good in us; we do. However, anything good in us has been tainted with evil. It touches everything. Without the redeeming power of Christ we cannot halt our own moral slide.
Because God gave you your makeup and superintended every moment of your past, including all the hardship, pain, and struggles, He wants to use your words in a unique manner. No one else can speak through your vocal cords, and, equally important, no one else has your story.
When you have a sense of calling, whether it's to be a musician, soloist, artist, in one of the technical fields, or a plumber, there is something deep and enriching when you realize it isn't just a casual choice, it's a divine calling. It's not limited to vocational Christian service by any means.
We cannot change our past. We can not change the fact that people act in a certain way. We can not change the inevitable. The only thing we can do is play on the one string we have, and that is our attitude.