Hi - I haven't posted here in a long, long time, but this thread really strikes a nerve with me. I am also a 'scanner' - someone whose interest gets piqued, and I dabble, become quite good at some things, but then, all of a sudden... meh. Nothing.
it's not a crime, don't beat yourself up over it. Just do what comes naturally. The bigger challenge, of course, is finding a life path that you love and that pays you hard cold cash with which, in turn, you can feed and shelter yourself.
Therein is the challenge for me.
As far as hobbies go - just go with it. Love what you are doing right now. That's all life asks of us, really.