That is false. K-12 will be an asset in getting into a PhD system, and sooner or later a tenure-track position. Speak to your existing advisor – hopefully s/he will shoot you straight.
In addition to, you will start out out with added benefits and a retirement match as a K-12 teacher (at least in a public program), and THEN you can determine if you want to pursue a master’s and ride the roller coaster of academia.
You will not be in a position to develop into a professor with no a PhD – you will finish up in adjunct limbo (with no added benefits and no job stability, perpetually on the hamster wheel to perform some thing resembling complete-time) if you only have a master’s and want to teach in larger ed.
But seriously – get some fantastic perform encounter ahead of going to grad college! Get that IRA/401k began although you are young! Dig your self out of any debt you can, get discipline-distinct encounter, and then assume about going back to college. You may possibly obtain your self a various individual with various interests in a handful of years.