Sitting here thinking about how one day, I won't be going to school anymore. One day, I'm not going to be able to see my friends every single day. One day, we're all going to grow old and forget about half the people we spent our first 18 years of our life with. Some day, some people will move far away, and we will never hear from them again. One day, my best friend and I won't talk every single day like we used to. One day, our young loves won't be around anymore. One day, I'm never going to speak to half of my closest friends I had at school.
One day, life won't be this easy. My favorite bands & musicians won't be making any more music. One day, all the things that made me happy as a child, won't be around anymore. My parents and siblings won't be around. I'll forget about all the good times I've had with friends.
One day, I'll be too old and weak to do any of the things I loved to do growing up. One day, life will change. I always say I want to grow up, & one day, I'll regret saying it. 
One day, life won't be the same.