I'll share my experience. When people around me are laughing, I'm more likely to laugh. Though I often laugh when I'm alone also. I'm not alone often, and never feel lonely when I am. I have been around people who have confided in me that they felt very lonely, even though they were surrounded by people. I have never developed a feeling of loneliness after hearing someone tell me they are lonely. When someone near me cries from pain or sadness or depression, I can empathize momentarily with them, but I don't come away from the experience crying, or depressed, or in pain. I often laugh when I'm alone, I rarely cry when I'm alone.

Ps, I have made no conclusion to my experience

Do you ever feel lonely? The results of new study suggest that your own feelings may actually make the people around you more lonely as well.

According to the results of the study, loneliness can spread much like the common cold. While a cold or flu bug might be spread through a handshake, loneliness can spread through groups of people via negative social interactions. Past research has found that lonely people tend to act more shy, hostile, anxious and socially awkward. They also tend to interpret social interactions differently, often seeing certain behaviors in others as a form of rejection or dismissal.