Maybe you are just interested in a little bit of everything and you quickly switch to something else? Well, it doesn't matter, switch over and enjoy it. Maybe someday it will trample you in some way
Difficult, but it works. Just put all the ways to kill time aside (computer, TV, etc.), sit down and wait. Where will pull - then yours. If not, start over.
Surprisingly, the right word you picked up, start wondering. You are probably already annoyed by this simple, but in order to do something, you need to start to be interested in something. It's very simple. I will try to help.
For example, I spent only 2 years (during which I tried everything I could: agriculture, painting, music, sports) to understand that I am not a musician. But I knew it for sure, as well as the fact that I did not lose these years - from each alteration I went out with new friends, each of them may be useful to you in the future. You may be good at it, but do not get hung up on one.
Don't give in panic. If this is your calling, you will come back and catch up. And a little advice, if you will. Do not regret anything and never.