Here's other quotes and sayings you can motivate yourself with. Practice only makes for improvement.

No one knows what they can do until they try.

You have something special. You have greatness in you. You have the ability to do more than you can ever begin to imagine.

Do something about your life now.

Your dream was given to you. If someone else can't see it for you, that's fine, it was given to you and not them. It's your dream. Hold it. Nourish it. Cultivate it!

That everyone won't see it, that everyone won't join you, that everyone won't have the vision... it's necessary to know that... See I wanted everyone to like me, I wanted to be perfect the first time around. IT'S NOT GONNA HAPPEN. You're gonna make some mistakes, you are gonna create some enemies whenever you decide to take on the world and go after you passion.

Accept responsibility for your life. Know that it is you who will get you where you want to go, no one else.