Actions speak louder than words. So don't screw someone over again and again and again, then say "I'm sorry you misunderstood what I said/did". Actions speak louder than your fake words. Your just a lousy person. Nope, no misunderstanding there.
It will hurt. It will take time. It will require willpower. You will need to make healthy decisions. It requires sacrifice. You will need to push your body to its max. There will be temptation. But, I promise you, when you reach your goal, it's worth it.