I have heard that, like with many things, women's parts down there generally aren't symmetrical in the first place and also it seems things changing and heading south is a part of the whole life process (aging and physical activity in that area, I guess). I very much doubt you are alone in that at least. All I can say to assure you is that it isn't an uncommon thing and your boyfriend probably doesn't care about what it looks like. It might be that this is something you have to try to put out of your mind, or if you think he's the type to respond positively, tell your boyfriend about it and let him reassure you.