Like many other derogatory stereotypes, being categorized as "Undeclared" or "Undecided" in determining success is just another way of reinforcing a hierarchy of superiority and inferiority.
This video does not truly go in-depth about this, however, it is more of a rant of stress that has been built up inside of me. I hope this helps you seniors in high school looking to declare a study and those that are already in the early years of college to not feel pressured to choose something because of societal expectations or other outside pressures. Stay positive and keep moving!