If you are at all introverted, remember that school is a 7 hour group activity. One of my kids just need to come home and have quiet time. Roughly about your age school became something she endured. She focussed her energy on her outside activities that we had to drive to and summer. She was a different person when around people who were interested in what she was interested in.
How long does the summer writing program last? If it is short would you like to add in another?
Here is another summer program you may be interested in. Applications close April 1st
https://iwp.uiowa.edu/programs/between-the-lines/2017-between-the-lines
You could email and ask if this program is still open https://www.rhodes.edu/departments/english/summer-writing-institute
Here is a program that combines language study with global issues. https://apps.carleton.edu/summer/lgii/
Don’t think of doing this just for the sake of college. Think of it as doing it for yourself so that you will have options for going to college where you are not the only smart one in the class.