I don't like my job any more. How do I keep going?

I graduated undergrad in the spring semester and started working full time immediately after. I did two different internships in the same field and loved what I did there. And for the first month or two of my full time role I've enjoyed that as well. But six months of doing this every day is just not enjoyable.

It feels like what I'm doing has no purpose and is just there to check off a box. Nothing unique or interesting has happened in the past month. The most frustrating thing is that every associate and director wants things done a different way even though we get the same result. Outside of work things are great, but Sunday night and Monday morning are the worst.

I recently got staffed on a project unrelated to my job title, and I've been dreading it. It's like they're speaking another language when explaining everything. When I go to do what they say information is outdated or the people from the other department want it done a different way. How can two departments make the same report differently? And why doesn't the partner reading it notice?

It's so hard to walk away from this job. I'm making more money than all of my friends and parents. When I'm promoted to associate my total comp will double from what I'm making now. The worst part about this all is that I'm only working about 50 hours a week. Long weeks are coming soon as the year ends.

Am I just being ungrateful for feeling this way? Or is there a way to force myself to enjoy work more?