I guess it's common for many INFJs to try themselves out here and there in order to figure out what fits them most. If you don't know where to start, try volunteering at first - it's a good opportunity to immerse and "feel" yourself in a particular field, instead of thinking of it (or overthinking it, as we INFJs tend to )
I totally relate to your aversion to anything business- and corporate-like. What you do has to be meaningful for you. I came across the dilemma between meaningful-rewarding/money-rewarding in my middle 20-s. I went for what made me tick and feel like I was doing something of value - psychology work, which was underdeveloped in my country and purely paid. Have no regrets :)
F. Buechner's words inspire me : "The place where God calls you to is the place where your deep gladness and the world's deep hunger coincide"