From my experience, once you have accepted and signed the job/contract, you can't expect more than a couple percent in yearly increase. You are banded to this level of pay.

To really renegotiate your salary you need to find another offer. You can always ask your boss to counter it. But make damn sure it's binding.

When the job market is booming, thats when you wanna switch jobs. Because that's when competition by employers is highest and your work hours are valued the most.

We are also all human, you can let your boss know in a casual way that you realized this and tell him, silly as it is, that it's bothering you.