Because life is short:
Never waste your time loving someone who doesn't love you back.
Leave the people who are not sure yet about their feelings towards you.
Don't say I'll never find someone like him/her, because there are other 6 billion people in this world are waiting to meet you. I'm sure that you will find someone so speacial among them.
Because Life is short:
Gather with old friends, and if you don't have friends then what are you waiting for?!
It is always fun to experience new things, meet new people, taste new food, watch new movies, play new video games and listen to new music.
Because Life is short:
Never forget to enjoy the nature. Watch the sunrise or the sunset, look at the moon or the stars, and take a walk in a park or a beach.
Don't forget to take pictures for every beautiful moment of your life (Because life is short*).