Oh don't worry about that. I'm also having the same situation as you, although I haven't even started my fanfic yet. but I have a lot of ideas and a lot of characters that I designed to add to my book. I'm in my second year of college and in my first semester exams right now.
I kind of feel bad that your parents will kick you out after you are done with your school. Do your parents not let you stay when you find a job? I don't know much about it because I'm Vietnamese and my parents like me to stay after graduation.
And I'm also busy with games too, but that's because I'm an achievement collector.
But you don't have to force yourself too much. Go Take a break, go outside, touch gress (see what I did there), and have fun while you can. I even take time practicing my drawing for my front page fanfic (looks ugly af but don't really care).
But I just want to say "thank you for your time and inspiration on making the best fanfic books I can even ask for. I hope your life will get brighter when you start your journey on your own."
Love
Your fan ❤️