You can't change someone who doesn't see an issue with their actions. You can only change how you react to them.
A person being "too busy" is a myth. People make time for the things that are really important to them!
Ungrateful people complain about the one thing you haven't done for them instead of being thankful for the thousands of things you have done for them.
People will hurt you and then they act like you hurt them.
Be silly. Be fun. Be different. Be crazy. Be you, because life is too short to be anything but happy.