You might have an auditory processing disorder. (Are you bad at singing? Do you need to take notes to remember lectures/instructions?)

You might have some social anxiety.

Are you bad at facial recognition? Bad with directions?

You might not be good at working fast or multi-tasking.

None of these things mean you are not smart and none of them mean you can't be very successful in the right job. I like others' suggestions of programming. How are you with logic puzzles?

Look for a high-paying career path. It's not just the salary; you will have better work conditions all the way along. (I worked in a restaurant long ago. People were competitive, cliquish and unfriendly.)

Check out r/girlsgoneswired. They will steer you in the right direction.