I'm intellectually unfit for school

I feel so impaired by schizophrenia in school and also work. I don't work, but that's because I can't due to schizophrenia that I've had since I was about 13-15 years old. I did manage, barely, to finish high school, but that was it was less severe. it's gotten more severe each year, even on 4 high doses of antipsychotics. They manage it decently, but I'm still struggling a lot with it.

I can't get on disability, even though I'm trying, it's just hard right now. I'm also in community college, but my highest grade is 69% in five classes. I just feel so disabled and I feel like a burden on my family. I have very, very few talents and I don't feel useful at all. I'm strong physically, so I can lift things, but no more than grunt labor am I useful. I guess it's due to the rest of my family either being so intelligent or skilled or both. My dad was given an IQ test in middle school and he scored a 160, and this is pretty typical for my family. So, maybe I set too hard of expectations on myself, but it's possible I'm just disabled.

I need advice. I hope there is some out there from other schizophrenics on this matter, someone with more life experience than 23 yr old.