人生地不熟

rénshēngdìbùshú
  1. to be a stranger in a strange land (idiom)
  2. in an unfamiliar place without friends or family

CEDICT

to be unfamiliar with the place and the people; to be a stranger in a strange place

Wiktionary

到新環境，人地生疏

維基詞典

Entry Composition

1 人生 rénshēng life (one's time on earth)
2 地 dì
  1. earth
  2. ground
  3. field
  4. place
  5. land

classifier: 片
3 不熟 bùshú
  1. not cooked
  2. unfamiliar