Edited for grammatical purposes (because I was pretty bad with grammar in high school):
"[You’re going to have to start thinking about college soon and] you think you know what you’re doing. I hope [that] when you open this your life after high school is well planned and most importantly, you’re happy with where you’re going and what you decide to do …”
This is an excerpt from the letter I wrote to myself in the first semester of my senior year. My english teacher made us write a letter to ourself about our experience in high school up to that point and also a few words to our future selves. When we finished, he then told us that we would have the letter delivered to us by mail after graduation. I already anticipated getting the letter a few weeks after graduation and I had fairly remembered everything, but I just happened to stumble upon the letter again.