I've been getting this message recently... to the point I can't ignore it anymore. Just do it! I started exercising again, I started posting more often... just yesterday I heard about a new job opportunity, and I was flooded with doubts, just as you describe....so the message is: just do it, try it, go for it, write that email, make that call. Thanks for reminding me that, it makes it difficult to come up with one more excuse!