So this one was kind of hard for me and brought up some emotions and what not but this is what I would write myself at 17.
1. You can run more than a mile so start running now, you will enjoy it.
2. Treat your sister well, there will be a day that you may think you might lose her too soon.
3. Don't waste your time in college. You won't find your husband there so move on and start your career.
4. Take tennis lessons, you love the sport.
5. You will have to face very hard emotional situations(watching your little brother and sister get married)but there is still a place for you in your family. You will love being an Aunt!!
6. People think you are funny and witty, stop being so shy.
7. You are beautiful so start acting like it.
That is all for me!!!