How are we made to sympathize with the monster in Frankenstein?

Mary Shelly created a beautiful metaphor in Frankenstein, of a creature who is made into this world, but looks out of this world. The monster represents all of the people who are somehow, in any way different than the rest, therefore mocked or bullied. It is not his fault that he was made this way, and yet he gets these horrific comments on his behaviour and his appearance form William and Victor and everyone else. People treat him badly, just based on the way he looks. For all these reasons, we should sympathize with him. Shelly want's us to see the beauty beyond the looks.