You have a clean slate every day you wake up. You have a chance every single morning to make that change and be the person you want to be. You just have to decide to do it. Decide today’s the day. Say it: this is going to be my day.
Every action you take is a vote for the type of person you wish to become. No single instance will transform your beliefs, but as the votes build up, so does the evidence of your new identity.