"Mean" is an adjective meaning "not nice, not kind". It deals with a person �s behavior toward another person, so all her life she has seen all of my behavior that is not kind toward her.

 Notice that there �s a play on the homophones prophet/profit here. It seems to me that "prophet" isn �t important to the sentence, but is just there for the wordplay. So, they took away her dream (for a good future, as indicated by "prophet �s") in favor of making money (maybe as a prostitute, as hinted to by "on the street")