The advice of "just go somewhere and start talking to people" has never worked for me personally because I'm a pretty shy/introverted person. Even at my current age I can't ever do that. What helped me most (especially in regards to getting out of the house that just made me more depressed) was getting a job because you're constantly interacting with people, so you get better and more comfortable at it. I don't know how old you are to see this as a viable option, but it worked for me. Volunteering is a thing too.