answer:Pretty much everyone is uneven, some more than others. If it doesn’t cause you any pain I would not think twice about it. It’s why when a seemstress does a hem for you they measure from the floor. Also, when people wore more pleated pants we used to be able to eyeball which hip was bigger if the trouser was a little snug, because the bigger hip pulled the pleat open. As long as your spine is straight it doesn’t sound like anything worth addressing. Hopefully, by your age, they would have caught soliosis (a curvature of the spine) if you had it. you would see that mostly in your shoulders as a tipoff though. One shoulder would be higher than the other. It doesn’t sound to me like something you need to go to a GP for, unless I have misunderstood. You don’t have any pain right? I guess you could wear a lift of some sort in your shoe, but I bet it would make you feel awkward since you only notice this problem if you look at the mirror.