I sometimes sleep during the day too (I just woke up today at 3PM, but I was in the ER all night so a little different) . It's not the end of the world so long as it doesn't cause you to miss appointments or things like that. But just because your sleep schedule is off doesnt mean you can't get on a schedule. For example, I make sure the house is clean once a day, take a shower once a day and eat 3 meals a day. Usually breakfast and dinner I do the easy microwave type stuff but for dinner I try to cook. Even if that's just thawing a piece of meat, seasoning it, putting it in the oven and heating canned veggies in a pan. I go to the store at least every 2 days and wash my clothes twice a week.

As far as having people to do things with, you could always just message your friends and ask if they want to hang out sometime when they aren't busy. I do this, but by choice I only have a few people irl who I enjoy being around. I also go to a day program where there's groups etc, but only when I feel like it. I spend a lot of time on the internet, probably more than I should.

The situation with your parents is unfortunate. I can't/Don't rely on any of my family for anything either. I think it's important that you learn to live alone because people won't always be around.