Life is too short to be spent constantly in stress. Try to worry about the things that you can change, forget about the rest.
It's incredibly important to always make sure that you reciprocate any love, support, friendship, or nice gesture that is thrown your way. Showing appreciation to those who care about you is one of the warmest gifts you could give.
The "rules" that have been set in your life are simply loose guidelines -- not absolute laws. If you follow these "rules", you are playing it safe and limiting your potential. Raise your ceiling and do something different with your life. You won't regret it.
When it comes down to it, everything in life is about being happy. Strive for it at all times. Even when things look bleak, work towards happiness. Because in reality, happiness makes everything possible.
Music
Sunshine
Water
Laughter
Purpose