is that you God or am i just getting sick?

I read a quote today about the idea that people face resistance when they are trying to create something good and that this resistance tells you that you are on the right track. And after I read it, I sat back and thought about it and wondered how it is that you tell the difference between resistance, God, and good old-fashioned fear.
Let's say I'm thinking of joining a dance troupe (I'm not, by the way) and I have a sick-to-my-stomach kind of feeling about it when I turn in my application. Am I experiencing resistance to my desire to create something good in my life? Or is it God gently reminding me that I am not gifted in that area and should move on to something else? Or is it just my normal life companion, fear, who sticks with me every step of the way?
If I'm honest, like completely 100% honest, I'd have to say that fear rules the day. That most of the time, I don't even stop to consider any other option. I just feel that feeling in my stomach and know I'm done. What's a life of creativity and beauty and risk compared to the possibility of failure and humiliation and embarrassment?
I think I'd like to change. I know I'd like to change. I'd like to push through the fear and push past the resistance and trust that God can change my path if He needs to. I don't think God cares if I join a dance troupe and make a fool of myself. I think God cares more about the fact that I wouldn't join the dance troupe out of fear of what others might think of me. I don't need life to throw resistance at me. I make enough of my own.

photo from: sciencephoto.com