Change Your Thoughts
The hardest thing someone can do is change how they think. Habits are hard to break. It takes time, patience and a lot of perseverance.
It is constantly reminding yourself of the new way to think, whether you have a physical reminder like a bracelet or piece of paper in your wallet that you read a few times a day or just thinking about your new attitude or visualize how you see yourself.
Day by day, you can make small changes that down the road will make a huge impact on your life, how you think and more importantly, how you feel.
Like all the habits you have gained in the past, eventually, your mind gets that you are thinking differently and it will starts to think that way, all on its own.