I actually get this alot, people always thinking they are not smart enough. Get out of your own head. In high school, i thought i struggled with math because of how it was taught at my school, i even failed and had to rewrite it, my tutor showed me how math should be (1/2)
And i fell in love immediately, and now I do math & algorithms everyday for a living. Millions in this country use one of my algorithms everyday and don't even know it. Get out of your own head.
This goes out especially to my friends and family who are creatives and don't think their are geniuses because they are not doctors, engineers or lawyers. I see the work you do, it's amazing. Just believe in yourself enough and keep working hard to change the status quo.