You were a Monster, meaning you couldn't go outside without the public attempting to injure/lock you up. You've got scars to prove it. Now, let's get one thing clear; Mosters have killed a good few humans, so that explains the reactions of others. Only issue is that that was 100 years ago, so it wasn't a very valid reason in today's day to attack someone, Monster or not. The only person to think that monsters aren't some sort of killing machines is you're bf, a human.