There is no problem in you.
You are comparing your processing speed with others. Don't do that.
Your perception works differently that's it. You can train yourself . And mostly people with adhd process something faster then others and somethings slower then others.
Relax and experience the world with your eyes. Don't borrow someone else's vision.
And focus on your strength.
Next Steps
and incase you want to understand your sensory integration better go for occupational therapy.
Health Tips
There is nothing wrong with you. All the best