Q: How do I know what I want, how do I know what will be good for me, I'm afraid of this power of thought, I am holding back, I'm not sure why.

A:  You don't have to know... ask the Universe for "all good things"... imagine yourself happy... then do as you please, go where you're drawn.

Sometimes we're afraid because we don't trust ourselves. TRUST YOURSELF. There's nothing to fear... you're innately positive, happy, and creative, so this is the nature of your thoughts.