The university extended a special trust to you. It was under no obligation to admit you for the current year, to assure you financial aid, or to provide you with a teaching opportunity. The fact that you did enroll indicates that you preferred its program over that of other schools and that you considered this university's offer more attractive and more generous than offers from other schools. Although you are free to resign, as long as you enjoy the privilege of being enrolled, the university has every right to expect that you fulfill your obligations. This by no means excludes legitimate protest.
Universities are places of protest by definition.
Protest is the lifeblood of academic freedom, a prerequisite for progress. However, universities can be havens for protest only if the process of learning is not curtailed. For learning promotes rational protest which is to be preferred to irrational demonstrations. In that case, protests through the proper university channels are in order. But never must such protests interfere with learning.