I write and sing about whatever I am able to understand and feel. I feel that it is healthier to look out at the world through a window than through a mirror. Otherwise, all you see is yourself and whatever is behind you.
Don't cheat yourself out of music. Music is one thing. The music business is another thing. Save enough of yourself to keep living anyway. Save enough joy in your heart to enjoy it. Let your reward be in the doing of it.