It really is easier said than done, but just remember that you are a wonderful person. It's not always easy to make a bad thing into a good thing and it's definitely not easy to always be happy but you have to decide for yourself. When you wake up you need to decide if you are going to think positive.
I also need to say that you always need to be you and never change yourself for anyone else. If you aren't you then that leaves the world unbalanced. You always need to be the best you, you can be. <3