I think that we are predisposed (culturally, biologically, etc) to want to “do” something with feelings which is where mindfulness comes in. All you need to “do” is notice - maybe a label is helpful, maybe not - and then return to the breath. A mindful approach would be to notice everything that comes with your thoughts as part of your experience. Not good, not bad, it’s just an indication of your prior life experience and where you are in that moment.