You’re wrong – you can talk about yourself. Your achievements, or lack thereof, don’t encompass all of the things that make you who you are. The things you’re referring to relate to nothing other than cultural norms, things that every person is “supposed to” obtain in life according to some societies.
Maybe you’re unemployed because something really negative happened in your life? Maybe you feel that your future is bleak because you’re having health problems? What even counts as accomplishments to you personally? Maybe you live with your father because he needs your help? Or even if he doesn’t, maybe he doesn’t mind helping you out when you need it?
Additionally, what are your interests? Your beliefs? What would you like to do? You might not have a lot going on right now, but that doesn’t mean that you aren’t inherently interesting. There are a lot of questions I just asked, that I don’t have the answers to, unless you choose to tell me. If you tell me, it becomes socializing.
We’re all complex – even when we’re down and out and don’t have much going on. Find the right kind of people to talk with and all of the things you feel you’re currently lacking in won’t matter as much to them. Pick up a hobby. Bike, hike, paint, draw, build, bird watch, write, etc. Find a group for anything you’re interested in and you’ll be around people who enjoy what you do.