Would someone explain to me whats the difference between vulnerable and being friendly cause i feel im walked all over by some people ?

I guess if you do what people tell you all the time when they could easily/should be doing it themselves, then I consider that taking advantage of a vulnerable person................... Obviously not if it's somethhing like "hey, pass me the ketchup." or something mundane like that, but like....... Uh.... Yeah, if they just take advantage of your good will then that's what I'd call it.