Have ever triedgoing to gym (or working in phisical work (helping a friend)), and consuming paleotic foods (no pizzas). Also, have a girlfriend. Additionally have some friends or relatives to go out or ask them to come to your home.
Additionally I will respond here and say that I don't think it's wise advice to recommend a Girlfriend (or boyfriend?) for the original poster. I don't know if you've ever suffered from depression, but you rarely even want to emerge from the house while suffering it. To say that you would be able to function in a loving relationship properly is a long shot indeed.
Working out, helpful, changing diet... sometimes helpful.
As for having people visit, I would say this would be helpful but would be dependent upon the situations for your depression.