Hi, I have the EXACT same problem with you as well. I avoid photos, talking with people face to face for any longer than 3 seconds, and i can not smile... people look at me and think im grumpy, when im not. So i do try fake laugh/smile a lot but i can feel my face start to twitch and i feel so depressed about it. A guy asked me to the school ball, and i find it difficult to say no, so i said yes. Its next week, and while others seem excited, all i feel is nervousness, worries, anxiousness, about talking with people, making sure my partner wont find me unfriendly or weird, and being able to NOT twitch when photo is taken. I hate my life rn, and because of other problem i have as well including this, i isolated myself from the few friends i used to have, and im currently just alone. Im really glad to know im not alone in this, it really helps. Sorry i personally still havent managed to find an solution to smile without twiching though.