[I originally posted this is the Mathematics Stack Exchange and was told to post it here instead]
This might seem like an odd topic for this forum, but I'm losing my mind. I am about eight months away from completing a Bachelor's degree in Mathematics. I am what you would call a "nontraditional" student - I am an adult who decided to change careers and I'm pursing my current degree online. My school, despite having a physical campus, has zero support in the realm of undergraduate research or mentorship. I've tried connecting with a number of my instructors, but as the program is exclusively online, it seems that they are not particularly interested in helping.
I hope to attend graduate school where I would also study Mathematics - I would opt for on-campus learning for this. Since I have no support, I have no idea how to prepare for the application process nor do I have any primer for how to jump into the world of mathematical research. I have a very high GPA and have aced all of my math classes, but this seems trivial when reading about how difficult it is to get into a graduate math program. I recently applied for a short-term research program for undergraduates, for which I was soundly rejected (I can only assume what about my background seemed inadequate). I've tried perusing papers to get a sense of the research landscape, but all of it seems well beyond my own abilities. I'm in quite the low place and it seems that things are quite hopeless. Does anyone here have any insight that might point me in the right direction?