need help getting motivation

(I’m 14F diagnosed with autism, GAD and depression. Also I have SEVERE maladaptive daydreaming, which can’t be diagnosed.)

^^ Personally, i do think the diagnoses above are a huge factor of my lack of motivation. Throughout my life, and especially now more than ever, I’ve struggled with a huge lack of motivation to do basically anything that isn’t my routine (wake up, brush teeth, go school and then shower) but even that is difficult to do now. But now, with mocks coming up and my body deteriorating and looking horrible, I can’t find motivation to revise (heaven knows I’ve tried, but I can never last longer than 5 minutes before I give up), do the things I used to enjoy (like reading or writing or drawing) or even work out. It’s difficult because I’m too scared to go out for walks for fear of being judged but whenever im in my room, I don’t have the energy to do proper workouts. I’m not allowed to go gym and I don’t have any friends, which could’ve probably motivated me to go out a bit more. I’ve tried to do that thing where you manifest it in your mind before you do it, but I just keep delaying it and delaying it and never finding the bother to actually do it. For example, I’ll set a time to work out (eg 8:00pm) but then as soon as the clock his 7pm I’ll be freaking out and just sit in my bed doing absolutely nothing until it hits 8:01, where I can’t workout now because it isn’t 8:00. With the Easter holidays currently, it’s gotten awful because I genuinely do just lie in bed all day, every day, only ever getting out to eat or go toilet or whatever such necessities. I imagine doing these things; studying, reading, working out, drawing, actually you know, being productive, but my body just doesn’t agree. My body doesn’t agree with my minds motivation if that makes sense? Nothing I’ve tried works. Like the inspiration quotes, or the routine-setting (because I can’t stick to it for some reason, and I LOVE routines so that confuses and irritates me) or the lingering fear of ‘if I don’t do this, my family will suffer’ or whatever that is, and I feel really guilty about it because nothing ever works, no matter how hard I try. Any advice is really really appreciated, but I know this is a very difficult situation. It was even difficult to explain, so I don’t blame you if you have no suggestions :’) thank you in advance though<33