Is this good for a fifteen year old?

Being selfish is not a good period .. you got the right idea, everybody tries to find happiness but we will never reach it cause we always want more. be happy with what you have specially if you worked hard and with honesty to get it. happiness comes to those that are willing to share the little things they have. remember that in some other countries that are not as lucky so take full advantage of what you been giving to get more and share with those closest to you and with those in need. We as humans worry too much, but look at a dog for example: they got no worries, and for them today is what matters, when they go on a walk that is the best damn walk they been on even if they were there yesterday. " don't count the days, but makes the days count" squeeze every single ounce of experience from this life taking risks and sharing it. Don't waste your time on filling those "holes" but appreciate the ones that have already been filled ... with time you will become a whole and that is when patience comes into play. life is not only about happiness but sadness, anger, joy, depression, fear, love, caring and confusion. we been giving the gift of experiencing all of these must don't just get hung up on one particular emotion. And always place your greater power ( GOD, Guardian angel.. what ever you believe in) over you and everything else.