Be in a minority of one
Definition 1 of 1
Pro Tip 1/3Unpopular View
Emphasizes your opinion is not shared by others around you. 
On the decision to close the park, I found myself in a minority of one.
Pro Tip 2/3Emotional Impact
Can express feelings of isolation or frustration when you're the only one with a certain viewpoint. 
Arguing against the new policy, she stood in a minority of one, feeling quite discouraged.
Pro Tip 3/3Individuality Highlight
Might imply courage or stubbornness in maintaining one's stance alone. 
Even when ridiculed, he was in a minority of one, proudly presenting his findings.