Actually, there's people who can be seen as super heroes, for example, there is a woman that can crush watermelons with her thighs, there's a family that can conduct electricity and not get electrocuted due to their genetic make up, there's also a guy that can completely collapse his shoulders into his body because he was born with no collar bones. These people could be seen as heroes if they used there genetic differences to help others in every day life, so yeah, super heroes are real, but unless someone breaks gravity or finds a way to change the flow of gravity around themselves, they won't be able to fly xD