Being happy doesn't mean that everything is perfect.
It means you've decided to live life despite its imperfections. So be happy because life sucks but you are doing just fine.

There comes a point in your life when you realize who matters, who never did, who won't anymore and who always will. So don't worry about the people from the past: There is a reason why they did not make it to your future.

Truth is I don't really think people can change. I mean at the end of the day you are who you are and its probably who you've always been.