It's not pretty, but rarely anything is. Welcome to life, kid.
Hardcore dedication and actual will to change is required. Prep yourself for it. Keep it in mind, always.
Get yourself hyped up and determined, write that feeling down and always look back at it. Make yourself a motivational poster and make it your phone background. Place some sticky notes around your room if you have to.
Just get angry, get motivated and get serious at least once. Make sure to look back on that feeling with almost every decision you make.
Just don't forget that you WANT change. You NEED change. And live with that want all the time.
That's the best advice I can give.