Failing sucks. Getting criticized hurts. I hate falling on my ass. But muscles grow when they break down. You experiment, fail, rebuild, and get stronger.
Do things that scare you. Strength is developed by leaving what's comfortable.
Find something you want with all your heart. Make it a burning desire.
Because no matter how difficult things might seem, how impossible they say it is, they can never break your resolve. One day, the universe will reward your ambition. It's going to hurt. You're going to sweat and shed tears. But keep fighting. Keep getting stronger. Pain is a good thing. Failure is a GREAT thing. It means you're growing.