What to go to Oxford but my life’s a mess? Is it still an option for me?

Hi, this is my first post so I don’t know if I’m doing this correctly. I’m a year twelve in the process of being dignosed with ASD. Basically my mental health is complicated (regular meltdowns and panic attacks, which I deal with myself) but things at home are also super complicated so I don’t get that much time to study as I’m a young carer for my sister (and my mum unofficially), also transport to school isn’t great. I want to become a biomedical scientist (though am flexible to change in direction) and started off doing a level maths, physics, biology, and chemistry and epq as well as a DELF b2. On top of other commitments this was a bit complicated so I dropped chemistry but now I’m really worried that this will limit my options later on as I really want to go to Oxford. Another complication is that I’m at a school where I don’t know anyone and really want to move but can’t, and next year things will be too complicated. I am also trying (and failing) to find laboratory work experience.This is turning into a rant but I would appreciate any advice or input about whether I’m making the right decision, alternative pathways, as well as general advice like to how to stay sane.