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 آپ get to be comfortable enough with your smile to دکھائیں it off someday. :)
آپ 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 شخصیات مشہور and people who are for lack of a better word are مزید attractive, so we feel down about our selves and think we are ugly سے طرف کی 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 آپ can do is be happy your looks aren't below average and just live the best life آپ can.
On a side note, I don't want to say آپ have to be happy with your looks if آپ don't want to but آپ do have to except them. آپ can mold them to be مزید appealing (to yourself) because in the end if آپ don't think آپ look good, anybody else's تبصرے will be meaningless to you.