“I’m just not a math person” is a label you stuck on yourself. Labels peel off.

Somewhere along the way a bad week became a permanent category, and now it is doing your thinking for you. Saying it out loud gives you a reason to stop trying, which guarantees the label stays accurate. Most people who believe it just missed a couple of steps years ago and never went back for them. Being behind and being incapable look identical from the inside.

Find the earliest thing you do not actually understand and start there, not at where the class is. Swap the sentence for a smaller one about what you are working on right now.