“I’m bad at math” is usually a sentence someone said to you once that you kept saying for them.

Plenty of those self-descriptions were handed to you by somebody else: a tired teacher, a joke at home, one bad year summarized too quickly. Repeating it turns a single comment into a standing fact, and once it is a fact you stop testing it. The evidence never gets collected because you stopped entering.

Take the subject you have written off and give it four honest sessions, with help, before concluding anything. Say it differently in the meantime: you have not learned this yet. Find out what your actual ceiling is rather than the one you were loaned.