Lotsa trouble in school

Hey y’all, so I’m 16 and a junior and school is just awful. I’m homeschooled, so I’m taking 5 online classes and 2 in-person classes (piano&art) and I’ve kinda given up? So, freshman year I got pretty good grades, all A’s and B’s, sophomore was worse; B’s C’s and an A. And this year is even worse. So far I have F’s in all my classes except for two C’s. I don’t know what’s wrong with me but I just don’t have any motivation to do school anymore. (my parents have taken away my phone, blocked youtube/all social media and nothing works) I can’t imagine myself having any kind of future, and even the end of the week seems so far away. I’ve thought that I might have ADHD since I was about 10, but my mom refuses to get it checked out (but she just told my Chem tutor that I have it?) and I dunno. I’m a smart person and I enjoy learning, but school man. I’ve tried like every study technique but nothing works. Maybe this is more of a rant, but I really need help and I don’t know what to do.

@elerrina
You sound depressed. GO see your pediatrician, family doctor, or therapist, ask for help.
Also, it sounds like homeschool’s not working for you anymore.
Repeat your grade in a regular HS: retake all classes you got an F in plus whatever you need for college and HS state requirements. Join clubs, find friends, and talk to a therapist ASAP.
Note that you’re expected to have the following classes for a moderately selective college : 4 years each of English and History/Social science (sometimes, economics&financial literacy and/or gov are required by the State) + each of bio, chem, physics + a foreign language up to level 3 + math through precalculus or calculus + art/music.

Why are you homeschooled? It would seem that the structure of school might be good for you.
I am the kind of person that is not good when just left alone, but excel when I have a structure.