I'm thinking I should go to the doctor. Soon.

I am only 15 years old and I have TERRIBLE lower back pain.
It hurts from sunrise to sundown non stop.
Recently, now that I have had school off for 3 days it seems to have hurt even more than when I have regular school. It hurts when I slightly bend my lower back forward or backward. I have also bought a bookbag that has two straps (instead of one, like I usually had) and reduced the weight of things I carry. Still no luck. It is a pain to get up at ALL. It hurts doing anything except sitting. I don't have scoliosis, either.

Did I damage anything with my old bookbag or what?

What do you think is wrong with my back?

This pain has been going on for over two months as far as I remember if not more.