Getting screwed over by my coworkers in terms of sharing workload.

I'm a 3rd year credit analyst in a commercial banking group. 

For the most part, it's a good gig. The work isn't overly intellectual, but there's legitimately a lot of money to be made. I really like the sales & customer facing aspects, and I'm hoping to have a role more focused on that in the future. My total comp is around $110K, which is really good given the usually decent hours. 

From when I've started here, I've been a "go getter." I've been very open about my ambitions to basically get into a relationship manager role. They have echoed the same on their end, given me great bonuses the last 2 years, etc. So I've been very pleased with my career progress. 

Unfortunately, I've been very frustrated with the 'day to day' in my role of late. It basically comes down to my role, finding that the expectations are unrealistic, not getting credit, a bunch of qualitative stuff like that. 

I work closest with two people. 

• Person 1 is way older - like a 50 year old "lifer" here. They have a senior title, but they basically have the same job as me. Basically, they just delegate everything. They pretend to be super helpful, but they end up going quiet when it's time to step up. They essentially aren't the point of contact for any external person any more, they function like an internal advisor. Super annoying.
• Person 2 is a bit older than me. They don't have the same career ambitions I do; they're satisfied in their current role. They don't do things to the same standard I do, so I find myself having to clean up their work a lot. Also, they do other irritating things like setting their out of office a bit early, so I end up having to take whatever thing comes up on a weekend, etc. 

A lot of the higher up people approach me all the time, because I'm the most dependable and eager. 

I have been a 'yes' man so far, and I likely have to keep on doing that. But I've been feeling like I'm borderline getting taken advantage of. 

How have you pushed back successfully in this type of environment? Or, at least, bargained for yourself to make it worth it?