TS, do not be offended if I try to decipher your situation. Your wife seems capable, contributes to the nest (probably more than your share) and cares for you (but not in the xmm/sweet young thing way). She probably can’t communicate her feelings or thoughts well to you and appears curt and nagging while you might wish to be the Alpha man but with a complex.
She goes through you bank account or bills perhaps because she feels you are busy studying and might be tardy in your financial management (face it, it might be true) and she is helping you to manage, eg. ensure CC bills paid timely manner, loans paid to not incur interest/late payment charges, etc. if she is good at it, let her assist you. I do let my wife do this as simply more efficient than me and I grudgingly admit she help me saved quite a bit of $ that way. Yes, it comes with heaps of nagging and arguments thrown in. Such woman needs to be heard and appreciated from time to time.
Give women credit when it’s due, they do think long term and she’s probably worry about accumulating debts and be prepared for extra financial burden when the kids come along (I suspect she’s probably late 20s to early 30s).
See through the storm clouds and recall why you were first attracted to her (hopefully not just looks and boobs). 6 years dating says a lot about how you both have “invested” in the relationship.
Contrary to what the keyboard Alpha men here suggest, it doesn’t hurt to humble yourself and start to make peace. Both of you probably too stubborn and proud to do so.
Start a weekly date-night and start communicating. Agree to avoid taboo topics (like $) for a start and focus on RE-discovering your common interests. You might want to start on “The Marriage Course” a 7-part self paced series, look for the videos on YouTube/Google course material. Best wishes!
This is actually very true of her. So true. Which is the reason why I'm hesitant on a divorce