I struggle the same way - often, though, I find myself toying with an idea, thinking "Sure, I could do that" and then focusing on all the reasons why it wouldn't work, talking myself out of anything I can come up with.

I think I have reached the stage of picking a direction and seeing what happens, now that I have the responsibility of a house and husband and daughter, all of whom get screwed if I decide that my true calling is to be a yak herder in Alaska.