What is something a lot of people find attractive that is actually a turn off for you

Makeup.
I mean, I don't have a problem with a little of it, but I want to recognize you without it. If you feel like you're ugly, try to improve slowly and not cover up literally everything, because then you are setting yourself standards you will not be able to hold up consistant for a long time, you are just disappointing yourself... and we don't want that.
If a person doesn't want you for the way you normally look like, why wearing makeup for them (I know that girls don't wear it to impress (most of the time), maybe they feel more themselves with it, idk).

I at least am holding my standards low so if any girl would ever like me, wouldn't have to make sure that they look like a Kardashian.