My back hurts

Patient: I’m 17 years old and I’ve had frequent back pain for almost five years now. I’ve changed my diet and lifestyle many times, and i do not partake in any intense sports. I don’t sleep odd, or strain my muscles. I don’t understand what could be causing this, its not an intense pain it just enough to bother me. The same for my neck. What could be the problem? (I honestly dont know the last time I had a checkup, doctors sketch me out)