Do you think my intellectual and cognitive issues were caused by me being hit by a car when I was 13?

When I was 13, I got hit by a car and fell backwards but I was fully conscious, I don’t think I had a concussion, and now there is problems in my working memory, but I have a pretty good memory but sometimes I would have short term memory issues. I had difficulty with processing speed and many people are noticing my intellectual and cognitive issues that looks like a disability. This causes me to have a hard time to write things that are my age level and many people say I write younger than I actually am. After I got hit by the car the hospital said I was fine and didn’t have a brain injury but even just mild ones I heard can cause these cognitive issues because ever since the accident my IQ has been lower than normal. I was wondering if this seems like it’s caused by me getting hit by the car or my disability? I was wondering what you thought because I was doing some research on this and this seems odd to me.

My lower than usual IQ was caused by me getting hit by the car even if I hit my head a little bit and fell backwards
My lower than usual IQ was caused by my disability
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Updates
14 h
Keep in mind I did have some developmental delays when I was 1 and talked later in life but my IQ has always been good as a child since I was 14. Mabye I am being paranoid I don’t know because my IQ seems too good to be true
Updates
14 h
And it sucks that I have to be this way the rest of my life
Do you think my intellectual and cognitive issues were caused by me being hit by a car when I was 13?
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