The worst thing that can happen is nothing. Though there is a risk of failure in any undertaking, there is a certainty of failure when you never even make the attempt.
Each time you get hurt, each time you fall short of the mark, you add another excuse to your arsenal. But excuses won't bring anything of value to your life. They only make you more skilled at avoiding the abundant goodness that life has to offer.
Forget the excuses. Stop worrying about failure. Life is yours to be lived. You'll gain nothing by hiding from it. The cold wind on your face may sting a little bit, yet it lets you know you're alive.
Fill each moment with new experiences. Fill each day with effort directed toward a meaningful purpose. It sure beats hiding in the corner. Though you'll occasionally stumble, you'll be stumbling forward, and enjoying the abundant experience of being alive.