Hi I'm 18 male and I've recently noticed a small bump (about the size of a rice grain, but I can feel it) right on the edge of the epididymis and I'm wondering if it could be a testicular cancer. I've read about the symptoms and whatnot but I'm not sure how to check if I have fluid in my scrotum or what it means by a dull pain. My lower stomach started hurting but I think it might be like a placebo effect because it started hurting after I read about the symptoms. I'm just concerned how alert I should be to this. And where would I go to get myself checked? (I'm a poor college student w/ no real medical insurance)

Thanks for reading.