Hey, I'm really sorry that you feel that way about maths, because honestly I think it's a pretty great subject that's very different to most other subjects in senior years (personally, I find that doing maths is a lot more straightforward than other subjects, because everything's set out for you). It's totally fine if you don't feel that way, though
Do you know what's preventing you from performing well? Exam pressure is one thing, but are you having a lot of trouble understanding the concepts in class, or just finding it difficult to apply them to questions? If it's the former, then getting more help could be the way to go - you can try asking your teacher to clarify things, or if they're not helpful enough, then a tutor might be a good option if you're open to continuing maths. If it's the latter, how much time do you spend doing maths exercises? I get that they can be boring and repetitive, but they expose you to lots of question types. In exams, this can be immensely helpful because if you've seen similar questions before, it'll take a lot of pressure off and allow you to approach them more confidently. High school maths really just boils down to practice in the end, and if you're willing to put the time in, you'll most likely be able to improve your results
Wow that was a lot of text, sorry! I hope it helped though. Don't give up on maths just yet!!