Something I've learned in my 22 years would be...
...best friends forever doesn't really always mean that.
...money does not grow on trees, but I sure wish it did!
...I don't know why I wanted to grow up so fast. Being a kid was too great!
...school was better before we had to read chapter books and do homework on weekends.
...your sister will eventually be your best friend, despite the age difference (of 13 years in my case!) and how much she hated you your whole life.
...it's not easy living in the real world. Bills are no fun, and they always have a way of surprising you!
...high school is not the best time of your life. It definitely gets better!