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Work on your attitude towards work and I swear things will improve. If you keep telling yourself 'I can't do this!' then you're only reinforcing negativity and you'll never be able to do it. You don't have to be all gung ho I CAN DO THIS but at least be open to the idea that there is a possibility you can do it. Like, when you approach a question, don't freak out and immediately think you can't do it. Try out loads of approaches in pencil first, on scrap paper or something, and if you reach a dead end, you just start again.

When you get something wrong, don't freak out, go back through every step and figure out if you've gone wrong. What might be useful is to get someone else to do the question and have them show you their working. Sometimes just getting an answer is not enough, you need to see the process they went through and compare that with what you did.

I think with maths, a strong understanding of algebra is essential in pretty much every topic, especially when you get onto harder stuff. Go back to basics maybe? You need to know how to apply general methods to a range of questions, not just how to solve a single question. And algebra's a big part of that. I dunno how your school does it, but I thought it was weird how American schools had separate maths class for algebra, then geometry, then calculus? It makes it seems like these areas of maths are separate from each other when they're really not, they all overlap and most of them stem from algebra.