I'm only 19, so I still have much life to live, but I think the one thing that has changed my life since is the summer before college. In a time that I considered to be limbo, I was so happy to be done with high school and to start off college, but so sad to leave the friends I had made. I don't know about you guys, but my high school experience was one of the best 4 years of my life. I heard so many horror stories of other people's high school experience when I came to college. People being so happy they're finally gone from the small town they're from or the big city that is overwhelming, but I hated leaving. That's why the summer was limbo.
Why did it change my life? Honestly, I don't know. I think it was realizing to take advantage of all the memories and times you spend with your loved ones and friends. This may be the last time you ever see them, so make sure you use every second of it to be happy with your friends. I used to be such a materialistic person, and I still can be, but there is no amount of money that can pay for all the memories I made with my friends that summer.
I know I still have much more life to live, but ever since I've come into college, I have definitely learned to appreciate the little things more, and to live and laugh, for it is short.