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не в своей тарелке stresses
gen.	feel like a fish out of water; pig-in-the-middle; unhappy about (sb., sth.); feel jumpy (Black_Swan); out of one's element (Taras); ill at ease; off-key (VLZ_58)
amer.	discombobulated (Antonio)
fig.	compromised (When I don't practice these habits, I feel compromised and overwhelmed. When I do, I am optimistic, creative and energized. VLZ_58)
fig.of.sp.	square peg in a round hole (ParanoIDioteque)
idiom.	unhappy about (Yeldar Azanbayev); like a cat in a strange garret (дословно "как кот, очутившийся на чужом чердаке". Выражение использовалось в США в 19 веке. CopperKettle); out of sorts (Yeldar Azanbayev); like a fish out of water (kee46); out of one's element (in a place or situation that is not suitable to a person КГА)
inf.	fish out of water (Alex Lilo); out of it (Andrey Truhachev); frog in the wrong pond (Putney Heath)
proverb	be out of sorts (быть); be not quite (быть; oneself); be out of sorts (быть); feel ill at ease (быть)
slang	the Willies the willies
"не в своей тарелке"
slang	feel cheap; chippy
чувствовать себя не в своей тарелке
idiom.	be like a round peg in a square hole (Баян); be like a fish out of water (Баян)

не в своей тарелке: 58 phrases in 8 subjects

American usage, not spelling	2
General	28
Idiomatic	6
Informal	3
Makarov	11
Proverb	2
Rhetoric	1
Slang	5