Struggling so much with the basics. At what point do you just give up?

I’ve been re-learning math since May and I still struggle with simple things like rounding and fractions. It’s so frustrating because I want to succeed at math to give myself a better life (college algebra is required for most General Ed requirements) but I still struggle with the basics. Even doing something as simple as counting currency is difficult because I can’t “hold on” to the numbers in my head as I add them.

At what point do I just give up? I don’t understand why I’m having so much difficulty when I learned this stuff as a kid. I struggled hard as a young kid and then never got above a C in math in middle school and high school.

I just feel so defeated today. I wonder if I have a math learning disability but I can’t afford to test it, and even if I had it I don’t know what difference that would make.