You are 16 & in 6th grade. Did you start late ?
Your health is okay .
What else you do, games, computer, book reading .
Try to your self regular.
Pray 5 times .
Read at least one page of Quran with translation .
Make a time table, get time for exercise .
Try to be obedient to your parents.
Read Rabe zidni Alman 100 times daily .
Inshallah you feel better .