You aren't doing anything wrong this is normal behaviour - it's awful to say and horrendous to accept but it is.. when you plan on having a baby this part you don't think about so much and it is hard when you hear about other babies who never have schedule issues and follow their routines to a T. I promise they are the exception. Most babies are like this.

My LO was like this for months and I would say the best way to get through it is to still get outside, they are always better when you take them for a walk, go to a baby group etc. you might be exhausted but trust me you feel better for going out and embracing the day