Is it normal for me to fel this way about a "friend"? what should i do?

So there's this girl. we started out cool. we met through work related circumstances. anyway she is the "rich girl" type. has money, parents supply her with whatever she wants. nice home & car, but u may think this is me being jealous, but that was never the case. the thing is that every time i visit her she wants "help" with something. "help me hang my clothes" or "show me how to clean my bathroom", things of that nature... assuming she grew up with maids and was never taught how to clean, i showed her. but there are other numerous things she does that just piss me off. we come from opposite backgrounds and countries. with me being black, i feel like she thinks i'm her helper that is also a friend. that i should jump up and do, when she wants something. then there's her attitude. a bit bossy but wants to be friends. there have been so many times when i bite my tongue to keep from going off on her. lately she has been bugging me to come over, i mean like 6 days in a row. and every time, i come up with a reason why i cant come or something came up. if someone keeps giving you excuses, wouldn't you give up?? i mean, she doesn't benefit me in any way, there is no point of even being cool with her, she isn't the type i would be friends with. but she is so persistent obviously i don't want to be friends with her, at all. i'm a very non confrontational type of person. but don't get me wrong. i'm from the hood and if you push me there, i will fight. but its just not me to be upfront with some situations. so should i stop being fake and tell her to leave me the fuck alone?