Why so lonely?

Man is born singly but live together. Though sometimes they join together around a table or in an occassion, some would feel alone. Why so happen? Where the lonely feeling come from? Why men always wanna others' company and why they can be so lonely that they call but have so little to say? Did they think over what they would say before any call?

I feel alone too, especially far away from home and always have to pretend to be happy and smile so much to others. I am not a saint at all so I have my emotion as any others. I wanna cry aloud and relieve my desperate and sad feeling.