The person you are is the person you chose to become. Every choice in your life changes how you really want to be. Beware of your actions and think deep before every step you're making, or you'll end up not knowing who you've become or how to get your old self back!
Listen carefully to everything you're told. In most of the cases, you can deduct a lot of things from what people tell you or talk about you and you can use them as constructive criticism. Don't let anything drag you down!
Do not sit around and complain about a failure. You know that you can make it happen if you think it through. So don't waste any more time trying to find excuses. Take the matter in your hands and make it happen!