lol you most likely won't get your face fucked up. especially if you are a light guy. most light guys don't hit that hard and such. boxing there's TONS of face punching...why don't you try Muay Thai..yeah you get hit in the face..but there's lots of kicks and knees and such so you focus on other stuff and some guys don't rely too much on head punching.
most guys use puncehs to set up a powerful kick etc, but it all depends.
i got my nose fucked up pretty bad, but my face doesn't look any different. I still look good, and got a pretty boy face hahah.
but for real, if your really concerned about it..
if you fight someone in sparring and once you get hit you'll probably think about not getting hit so much you won't do very good in the ring...it's something you'll have to overcome..which of course you definaetly could if you got in the ring enough. all takes time brother