I look completely different in photos. That's probably because the photos I'm normally in are for my job (I'm a model). I always try to remind people not to expect the same thing IRL because the girl in that photo has undergone hours of make up and hair and has help from specialist lighting, the talent of a really good photographer and, of course, however much photoshopping was administered to the photo. I won't lie, I won't deny it and I'm pretty upfront about how fake it can all be. There's also other differences such as my expression - in work photos, I'm normally not smiling, which is the complete opposite of me when not working. Outside of my job, you won't find many photos of me because I'm normally the one behind the camera - I figure my job provides me with enough photos of myself and so I can take a break in my everyday life.
--EDIT:
Wait. I do have one or two everyday photos of myself. I seem to wear underwear on my head a lot or pull the most idiotic of expressions. I'm letting lose! Rebelling! Waheyyy.