I'm sorry about your anxiety, Merope. However I'm sure it's nothing serious. It's pretty normal for people to have slightly different sides of the body. Eg I have quite a large difference between my left and right thigh muscles, too. Quite a few people have one foot larger than the other one, women tend to have a slight difference in breast size, difference in eyesight or can hear better on one ear than another... People aren't ideally symmetrical and having slight differences in our left and right body side is extremely common