"Life Is What You Make It"
This quote was said to me when I was younger by my parents, and it is the best thing they could have ever told me. Life is EXACTLY what you make it. If you want to be poor and unsuccessful then you will let it be that way, but if you want to live a HEALTHY, rich (not just financially rich), and fulfilling life... you will make it that way!
Everyone has dreams and hopes and let downs in their life, but if you REALLY want something in your life... you can make it happen. If you wake up one day and decide that you want to be an astronaut... then you need to do what you need to do to be that!
Always set yourself goals because that is the only way you will ever get anywhere. Yes, you WILL fail at times, but you will also succeed. Always push yourself, no matter what. Like I said, your life will be exactly what you want it to be... or exactly how you LET it be.