Just because you can't find it does not mean it isn't there. You said you are getting "too old", probably meaning you don't use torrent sites as most of the younger generation do. It's a lot easier to find music online than it is at the store. I also hate mainstream music.
Some bands/artists that I love: Mumford and sons, Fun, Anberlin, Imagine Dragons, Neon Trees, Eminem, Nas, Lupe Fiasco.