Kate, I used to do the same thing in pictures (not smile 'cause of my gapteeth). But I finally decided fuck it, I'm gonna smile! I hope Du get to be comfortable enough with your smile to Zeigen it off someday. :)
Du have average looks, your not strikingly beautiful but then again most people aren't including myself. I think people (again myself included) tend to base their looks on Berühmtheiten and people who are for lack of a better word are Mehr attractive, so we feel down about our selves and think we are ugly Von comparison. But that's like being mad at yourself for not having a million dollars like someone your own age who inherited it, its out of your control, the best Du can do is be happy your looks aren't below average and just live the best life Du can.
On a side note, I don't want to say Du have to be happy with your looks if Du don't want to but Du do have to except them. Du can mold them to be Mehr appealing (to yourself) because in the end if Du don't think Du look good, anybody else's Kommentare will be meaningless to you.