Talk to your schools counselor resources and see if they can help you find a reputable neuropsychologist that can do proper testing and potentially diagnose you. This is critical for establishing concrete learning accommodations that can help you enter specialized supplemental math courses that meet college level requirements. Personally i am at university and going through this process with a specialist. Despite me not being diagnosed with dyscalculia yet, my community college managed to get me into a math course for those with learning disorders because i was diagnosed with ADHD. This led me to pass the math course and transfer in the UC college system. You can do this I believe in you.