I greatly dislike it when people attempt to control others; I think that it's egotistical and self-righteous.
How dare someone tell me what I can and can't do! I can do anything, and everything, that I set out to accomplish. If I feel excited about a new direction/project then people should feel happy for me, rather than trying to convince me of their projections of impending failure. Instead of letting their words get to me, I remember that they obviously don't know me; they never knew me, and they don't want me to be successful. If they were to really look at me they would be awed by the depth of my energy, the strength of my character, and my willingness to continually take on more challenges.
It's a good thing that my optimistic voice and thoughts are louder than the negative voices speaking at me.