You can't learn singing..I think...u can get better at it but can't learn to hold a tune. I discovered some of my vocal stuff I do now when I was 15. I had these records sent to me that were like pop rock and they needed some more edge and grunge in the vocals. So I went to the forest and just yelled these songs until I discovered this raspy thing I could do when I tilted my head a certain way. Overtime it became like a natural part of my singing. You should do that too. Just sing all the time. Sing along to other artists and try to see what it is they do with their voices so u learn the techniques.