I think you may need to talk to someone about what you are going through. Caught earlier, you can beat cancer, if that is what it is. You just have to have the right mindset about it. Avoiding it and avoiding the doctor is not necessarily the best way to go, but I do understand your fears.
Please go to the doctor and get it checked. You are strong enough to beat this because of your age. I also suggest maybe seeing if you can find someone to talk to about your fears regarding your cancer concerns.