Dear 13 year old,
You are now a young adult. Learn a lot about life, about social skills, basic living skills, everything, pray for and find a mentor. Start contributing to society. Live as a young adult. Don't spend so much time or 100% of life in academics. You may be described as a kid, but don't let them make you stay young, take responsibility. You're a young adult who still depend on your parents. Don't worry. Time will come when you won't depend on them. Words like "teens" "teenager" didn't appear until the 90's.
If you're reading this and not a 13 year old anymore, you're not too late. Read "Do Hard Things".
Signed,
A 27 year old, who is still learning about life and living in parents' house.
