Hello everyone.
Eversince I studied art at college, I worked on self-portraits, only to discover asymmetry I never before recognised. I was shocked and upset, and like another poster mentioned, asked myself why me? I began a cycle of looking at my reflection constantly, taking pictures of myself and comparing them to models/celebrities. Editing them on photoshop to create my 'ideal' self-portrait, which obviously only made things worse and myself more unhappy.
So, I banned myself from looking at my reflection unless absolutely necessary, including taking pictures and making comparisons AND photoshopping. After a little while - not even a week, I became more relaxed about it and accepting. After just looking at those pictures, funnily enough I could kick myself for being so horrified. I used to look for things that weren't there, and emphasized my asymmetry. I still see certain 'flaws', but they are no where near as bad as I believed beforehand. At times bouts of unhappiness return, and after seeking comparisons with the 'beautiful' actors and models - the assymetry IS there too. We all have it. Everyone - even supermodels. Some had even more obvious 'flaws' than I did - and these people are well-known and hired for their attractive appearance. The evidence is there.
Our worst enemy is ourselves.
Right now I'm trying to accept the way I am, including my slightly askew jaw/chin; it is part of my identity and if it's noticable, yeah people will see - but they'll then move on. Fact: people care more about how they themselves look and could care less about your face. People rarely would take pictures of any of you completely head on to be able to notice anything, and these things just aren't noticable in "real-life" because we're constantly moving, at an angle, consider the lighting etc - which can also distort the way we look. The fact is, every single human being is assymmetrical in some way. I am certain there are many others that have an 'off' chin like me, as have a lazy eye/uneven jawline, including models because I've seen it for myself; which shows it is acceptable, natural, and in no way 'ugly' (aka they are STILL attractive WITH them).
It is the 21st century after all, and if you feel uncomfortable with how you look - it can be fixed; but I'd not recommend it if it is purely cosmetic. I wouldn't consider changing my face if a partner critiqued it - suck that! It obviously didn't bother them to have been attracted to you in the first place - and I garuntee if you take a good look, they'll have a few asymmetrical features here and there aswell that even you haven't noticed (just don't tell them!)
'accept it and move on' is so cliche, but it's significant; a lot of us do just this if we see something noticable in another person's face in the street. By the time you've sat down to dinner, you'll be far more interested in whether you've cooked the chicken throughly, rather than that 'that guy with a triangle head'.
IMO, most, if not all of us beat ourselves up about our own asymetry the most, rather than others. We notice it more, and it affects US not them. After we start to accept this, we will begin to relax. Just remember; asymetry is natural, and all these posts prove that others have it like you and me including models, actors/actresses and those on the '100 most beautiful' lists (I got a bit OCD about my asymetry compared to others

). And if it hasn't affected those considered very attractive, to me, it shows asymmetry is only part of our beauty.