How do I deal with Impostor Syndrome?

Hi, I'm a 4th year robotics engineering student at UC Santa Cruz. I guess I picked robotics because it involved both computer and electrical since I wasn't sure. Currently, I'm struggling in classes, especially the electronics class that I'm taking, and the prof gave me and my friends extra time on the assignment...but I can't help but think "Oh, he's only being nice to us since we are girls"

I'm a first-gen college student and I had a sexist mentor through a scholarship that said very sexist stuff to me. I left them for good. Then this summer I found out that his family gave out an internship to a scholarship friend of mine who is also in engineering just because he was a dude.

Feels like walking on a thin string and being watched. Mistakes are not allowed, or else i'm not good enough. I want to escape that feeling but I can't. I stress out to the point I forget to eat. How do I get through this?