Lots of people are lonely, but you have the false assumption that being around another person will fix your loneliness. Do you not remember the nights intertwined with someone wishing you could be anywhere else? You just desire what you don't currently have, and it's normal human nature, but your issue seems to be of a greater spiritual emptiness that no one person alone can fill, nor will ever fill. Perpetual longing is the default state of man and you suffer because of this desire,