@tinea Welcome to Mayo Clinic Connect, a place to give and get support.
You broke your nose over 13 years ago and you have had this issue since? That is a long time to have dealt with this issue. Did you ever go to see an ENT provider/doctor?
People on Connect cannot diagnose or give medical advice. Is sounds like you are saying is that your issue originates from trauma that was left untreated. I don't see evidence that points to cancer. Has anyone ever mentioned a deviated septum or nasal polyps to you before? The only way to adequately diagnose and treat your condition is to go to the doctor. It can be anxiety provoking to see a doctor, due to fear of a bad prognosis. The most likely outcome of going to the doctor is that you find a way to feel better.