why do teachers hate their job?

(sorry if this is the wrong flair)

hi! im actively in school working towards a degree in theater education. every few days on here or on facebook i see a long rant about someone HATING their job and regretting every second of it. before i commit thousands of dollars on this degree: why do people hate teaching? like… genuinely hate it? and why would you get a job as a teacher just for money and be shocked when its not your forte? teaching has been my dream job since childhood and now im worried im on the wrong path? please don’t hold back at all! i want the full honest run down of being a teacher. thank you!