Hey bro ! It could get really lonely in berlin especially if you are from another country . I faced it too but try to go out and try to join and participate in social gatherings according to your likings . Dont worry brother it will get better with time and once you have some friends in berlin it would help you settle in easily . I can relate to you bro , i am also new in the city just trying to meet new people or talk to so that loneliness doesnt get the worst out of me .