белая ворона(To stick out like a sore thumb is to not blend in with your surroundings or to not match what others look or dress and act like: Don’t make them feel like a sore thumb for not pandering to the “norm” of drinking culturevogeler)
отсвечивать(в знач. "привлекать к себе излишнее внимание, выделяясь из толпы"; в контексте: Try not to stick out like a sore thumb, and behave like you know your way around the place.4uzhoj)