This character is lonely. A lonely person is one who has no companions or friends; is lack of sympathetic or friendly companionship, intercourse and support. This person may or may not feel depressed because of their situation, it usually depends on whether they are aware of it or not.
Loneliness is a complex and usually unpleasant emotional response to isolation or lack of companionship. Loneliness typically includes anxious feelings about a lack of connectedness or communality with other beings, both in the present and extending into the future. As such, loneliness can be felt even when surrounded by other people. The causes of loneliness are varied and include social, mental, emotional, and spiritual factors.