Meaning of the word "every horse thinks its own pack is (the) heaviest" in English

What does "every horse thinks its own pack is (the) heaviest" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

every horse thinks its own pack is (the) heaviest

US /ˈev.ri hɔːrs θɪŋks ɪts oʊn pæk ɪz ðə ˈhev.i.əst/
UK /ˈev.ri hɔːs θɪŋks ɪts əʊn pæk ɪz ðə ˈhev.i.əst/
"every horse thinks its own pack is (the) heaviest" picture

Idiom

everyone believes that their own problems or responsibilities are the most difficult or burdensome compared to others

Example:
She is always complaining about her workload, but every horse thinks its own pack is heaviest.
I know you're stressed, but remember that every horse thinks its own pack is heaviest; we all have struggles.