most chanllengeing thing in my internship!!!!

one of the most challengeing part of my internship is to say no to someone. im a person i dont turn away from easily and say no to if u ask me for something to be done il say yes and finish it fast and comlete.in my internship i always hear my name around HEPPAC and i always go where am needed. i also get the job done nice and fast. its good i dont say no easily to do something at my internship so anywhere they say my name im there. the problem with not being able to say no is i wont be able to do my indepented work such as my school work. so now i have to work on saying no when its needed and finish my work that is being ask for in my internship.