How do you

How do you get your 1 month old to sleep without needing the boob in his mouth?. I know it's probably my fault for training him this way but ever since he came home from the hospital he feeds whenever he wants there is no 3 hours apart with him. I was told I'm overfeeding him as well. He just finds comfort in the breast when he's In pain or wants to sleep he cries none stop for them even if I give him a 4oz bottle he still wants the breast. I'm going back to work in 5 weeks I need help to understand how to not make him dependant on my breasts.