Hi everyone! Like crooked above and others here, I too was glad to find this forum. I face the same asymmetry problems that you guys have described. Thing is though, it's not just my face that's obviously asymmetrical. It's my whole body.
When I was a kid, I noticed that my ears were weird. One sticks out more than the other, and even feels softer. I also noticed that my smile was crooked. At age 16, a friend commented on how my chin was bigger on one side compared to the other. I never noticed it, and even after this comment, I remained oblivious to it whenver I looked in the mirror (I just saw my weird ears and how one side of my lower lip seemed *slightly* bigger than the other side).
At age 19, I fooled around with a camera and took a close-up pic of my face...and that's when it struck me. What came out was this blatantly asymmetrical face that I didn't see in the mirror. It looked like my right side was bloated, and in contrast, someone had let the air out of my left side! That night sort of squeezed every ounce of security out of me (and made me kind of anti-social, I must admit).
From then on I started noticing all the things I never noticed (or never cared). One side of my back (left) is flatter than the other (also pointed out by a friend who patted me on the back, and also ignored by me initially). My right leg is shorter than my left. When I feel the top of my skull, the left side is flat, and the right more rounded. Even facial hair grows at a faster rate on the right side.
Just a moment ago (after reading this forum), I toyed around with google and found something called "Hemihypertrophy". My symptoms seem to perfectly match what was being described, including having a curved spine (a condition called "scoliosis"), which is why one side of my back's flatter than the other side, apparently caused by different leg lengths.
I admit it freaked me out, but I realize I've grown up healthily to reach 25, and if any problems were to occur, at least one would have already. Live with it I guess?
On a side note though: I've had people saying how "hot" I look when they see my pictures which I, of course, take from one side. Go figure

. Wonder what they'd say if they saw my face up front though...