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a lonely little petunia in an onion patch

To be out of place among those one finds unpleasant, uncouth, or overly aggressive. Taken from a 1946 song of the same name by Johnny Kimano, Billy Faber, and Maurie Hartmann. I'm feeling really uncomfortable in this rowdy sports bar, like a lonely little petunia in an onion patch.
See also: little, lonely, onion, patch

plough a lone/lonely furrow

  (mainly British literary)
to do something alone and without help from other people He'd always been happier working in isolation, ploughing a lone furrow.
See also: lone, plough
References in classic literature ?
Ben Weatherstaff," he answered, and then he added with a surly chuckle, "I'm lonely mysel' except when he's with me," and he jerked his thumb toward the robin.
Then they went into a dark and lonely room, and here they found a pale, sad-eyed child, who wept bitter tears over a faded flower.
And with busy love toiled the Elves amid the withered leaves, and new strength was given to the flower; while, as day by day the friendless child watered the growing buds, deeper grew her love for the unseen friends who had given her one thing to cherish in her lonely home; sweet, gentle thoughts filled her heart as she bent above it, and the blossom's fragrant breath was to her a whispered voice of all fair and lovely things; and as the flower taught her, so she taught others.
But they tell me that most people, especially of your age, find London a terribly lonely place.
Consider this, my dear, and tell me whether you will take the empty chair at an old man's lonely fireside.
In the gray quiet of the evening we roamed about the lonely gardens, and threaded our way through the rank, neglected shrubberies.
They thought of it as a land of wild mountains and glens, a land of mists and cloud, a land where wild chieftains ruled over still wilder clans, who, in their lonely valleys and sea-girt islands, were for ever warring against each other.
He is like moonshine in a winter night when a man freezes to death on some lonely mountain top.
I am no more lonely than the loon in the pond that laughs so loud, or than Walden Pond itself.
I have two pewter soldiers--this is one of them, and he shall have it, for I know he is so very, very lonely.
The one ray of light that cheered the wintry darkness streamed from the unguarded window of a lonely house, separated from the vicarage by the whole length of the church-yard.
Midway in the dark and lonely place the two stopped and consulted together in whispers.
But, of course, you--you'd want her, your sister's child," ventured Nancy, vaguely feeling that somehow she must prepare a welcome for this lonely little stranger.
There were people who had openly pitied her lonely life, and who had urged her to have some friend or companion to live with her; but she had not welcomed either their sympathy or their advice.
I determined to stroll home in the purer air by the most roundabout way I could take; to follow the white winding paths across the lonely heath; and to approach London through its most open suburb by striking into the Finchley Road, and so getting back, in the cool of the new morning, by the western side of the Regent's Park.