loner
//ˈloʊ.nɚ//
Noun
lonerSingular
lonersPlural
1
A person who prefers to be alone and avoids the company of others.
He's always been a loner and prefers to spend time by himself.
2
A person who is often alone, either by choice or circumstance, and does not seek social interaction.
He has always been a loner and prefers spending time by himself.