Baby doesn't want anything but the boob 😭

So Ive always breastfeed, but latley Im planning on going on getting a job but my baby girl which is 4 months doesn't want anything but my boob!! 😭 She wont take a pacifier or any type of bottle we've bought her. We've tried many methods such as leaving the room, hold it as I hold her when I breast feed her, I have no idea what to do I feel so helpless! Any suggestions? Has this ever happened to any of you if so what did you do? Its driving me crazy lol!!