The young man is singing about his feelings of loneliness.
The young man's song is a heartfelt expression of his isolation and longing for connection. He sings of how he feels like an outsider, adrift in a world that doesn't understand him. He yearns for someone to share his thoughts and feelings with, someone who will love him for who he is.
The song is full of imagery that highlights the young man's loneliness. He compares himself to a "lonely bird" and a "lost petal" that has been "blown away from its stem." He sings of how he feels like he's "falling" and "drowning" in his loneliness.