How to deal with this.

Okay guys, i know this is going to sound fucked up and i feel so bad but ughh. i need help. So my bestfriend started working. She does not have a car, so i'm the one who takes her. Her job is kind of far and she doesn't give me gas money. But there's times that i just want to go straight home to relax but i always have to take her !! . she always tells me "oh so yeah today you're taking me" not like a question . is her telling me . and i dont say no because shes my friend and i dont want her to say that im a fucked up person... how do i deal with this. i feel so fucked up but ughhh some times i just want to tell her why she lied at her interview saying she has a car when she doesnt. i need help asap