I feel very lost and lazy

I really dont know where to start because it's alot. It's my last semester of high-school. I only have 3 months left then i have to do exams that decide my future. I do get good grades and I'm really good at memorizing things, i like biology alot and chemistry. But i just cant anymore, i cant study, i dont know how, i dont know how to memorize, i don't like chemistry anymore, i dont like school. I'm barely studying, hell im barely showing up at school. I tell myself i need to study but i just cant, i hate seeing the day pass by, i hate losing any minute of my time. I used to be really disciplined, Id clean my room, every nook and crany, id do my closet and clothes neatly, I'd take care of myself, brush 2 times a day, bath or shower every day, workout. But i just cant anymore, i barely do these things. I feel so uncomfortable not doing them its the only reason i do them, barely atleast. i feel constantly tired and unmotivated, i dont want to get out of bed but i know its bad. i feel lonely, im talkative but really introverted. i used to be really extroverted but it changed as i grew up. I don't have real friends, my family despises me even though i do all the work around the house, im so tired of everything.I can't even procrastinate, im tired of my computer, watching anime and reading. I tried making so many schedules but they dont help at all. I have noone to motivate me, everyone i know does the opposite, Id actually like to be a doctor, i like medicine alot but who cares ill just do some 9 to 5 i hate for a shit salary for the rest of my life. i hate school, i used to love it but i cant stomach going there. i cant stomach doing anything social.i hate life, i know its hard and unfair but im going to complain anyway. Noone respects me