In your dream, you were bitten by a weasel, which may symbolize that you have unresolved emotional problems and show your weakness in this respect. You may be entangled in problems or troubles.
You dreamed that only one person was bitten, and no one else was bitten. It may be that you are afraid of something (it may be making a fool of yourself in public), that you are inferior to others in some way, that your weakness is seen through by others, that your friends are untrustworthy, and that you feel helpless.