You searched for: “anuptaphobia
anuptaphobia (s) (noun) (no plural)
An excessive anxiety of remaining unmarried or alone: Many people afflicted with anuptaphobia about remaining single view the world as being populated by couples.

Sometimes those who are affected by anuptaphobia, or are unwedded, don't want to be considered socially different than most of the other people or they don't want to grow old and be alone.

Those who suffer from anuptaphobia have a dread that other people will consider them as being rejected by their friends and acquaintances, and that no one wants anything to do with them.