I didn't have a regular bed during most of my childhood and for several years when I moved out on my own. Finally I bought a real bed - mattress and box spring but no headboard or footboard and it's been well worth it, though a hassle to move.
But if yours isn't helping your back why not try something else? You have nothing to lose, especially if you keep your old bed while you try out the new one. Sleeping on the floor is normal in many cultures. North Americans are the weird ones wanting beds so high off the ground.