What are some things to do to make my back stop hurting?

I have kind of, a big chest, so to speak. And, it caused me to have a curved spine but i dont have scollyosis. They said nothing was wrong except that it is slightly curved becasue my chest makes me slouch. My back has been bothering me ever since before then but they said nothing is wrong. it always hurts, but not a big deal, just like, in that annoying way. you know? if i stretch, nothing happens. Do you think if someone just gives me a quick mage, that would help? or some sort of stretching? I dont know what to do.....