No worries on that front: I grew up dirt poor. Now I’m at a well known HFT firm. I know this quite well. I absolutely don’t belong.

Edit to add: I’m never allowed to forget that I don’t belong.

Had the same experience at an extremely well known hedge fund.

Good luck and keep your head down, but also once you get to a comfortable position, find a good exit.

There are better environments and finance isn't at the top of the pay pyramid anymore.