Thank you, know we at least know its the same woman that is selfish. Obviously you should have seen this from before marraige but you might have been blinded by love, so lets work on the situation to improve it for yourself.
There are different approaches as the previous posters have indicated but most seem to point to tell her without being so concerned about her feeling. Dude, I'm 31 and I think you deserve the right to have feelings too, hers are not more important than yours.
So she might think you must pay when you go out... but what if you stop going out stop buying whatever stuff for her.. she cant force you to go out or buy stuff... just tell her you cannot afford it currently. Be the man, if you have to pay for everything you are the boss. Her dad was probably the boss, so tell her if thats how she wants to play it in that you pay for everything, then you are the boss and you're putting your foot down just like her dad woudl have.