hi uhhhhhh (really cool choice of username btw)
No such things as posting too much on here! That's what the forums are for. Sorry to hear that you're dreading school. I am a bit too, though I'm in my 40's and it's uni, just to be clear where I'm coming from.
I think with everything going on with your poor mental health, new school, going online etc that your grade outcomes are understandable. Good on you for wanting to do better this year. So, to be clear, will you be at school this year and not online? I mean, most people find it hard to stay motivated online, so...
I think some strategies that work for me are: having a timetable. So setting one up and marking out when I'm going to study, take breaks, commitments whatever they might be. Putting all of that in there so I know I can meet deadlines, and keeping a diary of course so I know when things are due. Also, study buddies if anyone is keen, can be great, even if it's just to chat about assignments or set a time to just sit together and work on assignments without even talking.
As for staying invisible, I'm really sorry that you feel that way. You're a human being and therefore worthy of being seen and respected, just as you are. Is there an LGBTQI group at your school where you might find community? If that's something you're interested in, of course. Having good people around you will help you stay positive, so it's great to hear you've made some nice friends. Also, I wonder if it might be a good idea to think about how you might respond to any negative interactions? So that you've got a plan in advance.
Happy to chat more. Maybe others with more experience might chime in too.