Life is too short to wake up with regrets. So love the people who treat you right. Forget about the one's who don't. Believe things happen for a reason. If you get a second chance, grab it with both hands. If it changes your life, let it. Nobody said life would be easy, they just promised it would be worth it.
There are only a certain amount of days we will live on this earth, and no tomorrow is ever promised to anyone currently living. Since we know that ultimately we will only be on this earth for a certain unknown amount of time, it is our duty to leave as big of a mark on this huge world that we possibly can.