Sorry, I meant it to be a time-ordered correlator, but just got lazy when I was typing and didn't include the time-ordering symbol.Conventional Feynman diagrams represent time-ordered expectation values, not Wightman correlation functions. (The latter need the CTP formalism.)
I try to do that, but then I feel like I'm following the math blindly without having any physical intuition and this in itself feels uncomfortable to me.If you really want to understand quantum physics, concentrate on the formulas, and view the talk about it only as a very loose and fallible guide.
Thank you for being patient with me, I really appreciate it!Don't worry about it. It happens in physics all the time. You start out with stuff of dubious validity that gets corrected later, either explicitly or you are supposed to cotton onto it yourself. But what you have done is developed intuition which actually is more important. The only issue is not realizing whats going on and even then it generally causes issues only when discussing foundational issues rather than actually solving problems. Guess what most discuss here .
I think a big part of my problem is, when I first was taught QFT I didn't give these notions much thought as I was already completely bogged down with trying to get a grip with all the formalism, and it wasn't really expounded upon by my lecturer. Now that I've had a little more experience with QFT I'm questioning all these aspects a lot more, and I am in a constant state of worry and confusion that I don't really understand at all what is going on