I know it really sucks to be in your situation and your complaints are absolutely valid, moving schools sucks a lot especially if you’re socially awkward and transferring in a later year. I can’t really offer any advice because I’m guessing it’s quite different for girls compared to boys (and I’m generally not too socially awkward), but it’s still worth trying to make friends, because once you find your friend group, things could change a lot.
Moving to fort st doesn’t sound like a terrible idea, but it won’t solve every problem, moving to a new school in year 11 would definitely still be tough. Still worth a shot though I guess