What could be wrong with my back?

It has always been like this how ever I do lift weights im 235 lbs 6'1 and im 15, bulky. My back is sort of like a ? question mark its not all that curved though im not like the hunchback of notre dame its really noticable when my shirts off or im in the weight room "I use good form and like i said its been like that way before hand (doctors suggest 2 things when i was young i was slump over alot or it's a rare genetic problem) I hardly feel it maybe only when i have to stand for a long period of time so could any please tell me what the problem is here? it does not effect my daily life period