Take responsibility for your own decisions and don't let others make your decisions for you. You have no one to blame other than yourself. It's your decision and you are in control. Obviously if you are in a partnership then decisions should be made together, but make sure you are not railroaded into a one sided decision. Negotiate, compromise and then take responsibility.
Action is the key.
Do everything it takes, but also be patience for the outcome. It is a common reaction to doubt. We all make mistakes, but at least you are moving forward. Just pick yourself up and carry on with more action. If you live by this rule you will at some time reach the success you desire.