DMing is an art......
Is a balancing act of planification (players need a world to interact), flexibility (because players often defy expectations), storytelling (to make the canpaign compelling so it lasts more than one sesion), game design (to create interesting challenges) and acting (to get players invested in the characters and make the campaign feel alive)
Is not easy, but if you pull it of, you deserve the title of "master" the DM title contains XD