Why am I so stupid?

I'm just so like stupid.
when I was in high school and in school I missed a lot and would skip school. I got sick a lot and missed a lot of days. Which I was placed on an IEP which is special classes. some of my classes were normal but I missed a bunch of school throughout middle and high school. My psychology class one day took a IQ test and I got like 73. like am I able to live on my own? thats borderline mental disability. I feel so worthless and by my not changing and repetitive posts I now see why I'm just plain stupid... I wouldn't have a car if I wasn't paying it off from my mom. I wouldn't have a home if I wasn't living here. I help out with the bills. But I feel so stupid, and so incompetent. I struggle with tests.. I feel so stupid. sometimes things don't click with me. if I'm intellectually disabled I wanna know. Because I can kinda prepare for it. I was working with disabled adults for a while and I quit because I felt like "this is me" I don't know if I'm overthinking it but I'm so worried. how can I find out if I am? I feel really mentally disabled. I am in therapy and I have depression and anxiety. But, the thing is I am 24 still living at home, I have a half paralyzed dog, and I feel stupid. Compared to my friends, they are smart and quick witted and for me I feel like sometimes they boss me around. I don't know if it's due to lack of self esteem and confidence but I worked with mentally disabled adults and I mean I am not as bad as them (NOT BEING MEAN) but I feel like a step down I would be. I have a hard time talking I got social anxiety and I am introverted. Sometimes it takes a while to process stuff, I know the basics of life I can take care of my laundry, cleaning, and taking care of my dog. But even then I feel like he goes neglected because I worry about myself a lot. I get stuck in my own brain, and I have a hard time with reading because I get distracted easily so I have to keep reading it over.
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I do have ADD and struggled with reading comprehension In school as well with math. AND science. I loved English class and always got good grades there. But I don't know. I'm quiet and am trying to talk more for my social anxiety to help with it.
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It scares me, it really does.
Why am I so stupid?
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