What is the chance of developing cancer at 17 years old? im currently worried and anxious about that disease?

Rare: Cancer has been documented at any age from birth on. The types & frequency vary with age but all forms are rare compared to other types of health problems. If you are pre-occupied with cancer fear you need to find a therapist to help you explore where it came from & teach you how to deal with the stress. It is not uncommon for teens to have such fears about life ending conditions.