What is it like to be in prison? Is it true that if you tell a guard about a situation, are you considered a snitch?

It is like the movie "Groundhog Day", where everyday is the same, over and over where nothing changes.

It is 100% true that if an inmate tells a guard about a situtation and others find out about it (and they always do), the inmate will forever be tagged as a snitch and will face retribution for the balance of their sentence. In many cases, the snitch will either need to be placed in protective custody or asked for transfer. The oldest saying in the prisonyard: "snitches get stitches".