Don't know what to do anymore

Have had brain fog for so long,, turning 18 this month, and just havnt been able to live my life because of it, ever since I was 13, had to drop out of school, never had friends or hobbies, basically just laying in bed with nothing to do for nearly 5 years now, parents don't seem to care much and nothing I try ever works, so close to just giving up, idk what to do about it all anymore