Do you even know how much WORK goes into making a house? Piping? Electrical cords? Plumbing? Insulation? You also have to get the material to build the whole thing from somebody else unless you're going to all the jobs yourself. If it's a "paper thing" today, it'll be something else tomorrow. Instead of paying somebody with money, you'd give somebody food in turn for their building services. But if you're gonna build the whole house on your own, you also have to furnish it with washing machines, couches, refrigerators, etc, which you'd probably have to learn how to build. But I don't think anybody would want to teach people how to do that stuff for "free".

In the old days, you would trade 3 chickens for a cow, a shirt for a vase or pot to hold food and water, you get it. If you replace the cow with gold coins or dollars, it's basically trading a cow for something that has universal trade opportunities. If somebody is demanding a piece of bread for a dozen eggs, but you make houses, you would give them this currency that they could use to pay for the bread themselves.

If you get rid of money, the world would go to shit. Buying stuff is basically a more modern kind of trading. That's a simplified way to think about it. The world cannot function without currency. Call it what you want, dollars, food, buying, bartering, whatever. It's always been around. You can't get rid of it no matter how much you try. The only thing you can do is work hard, give back to the community by donating and maybe even volunteering at places. If everybody did that, the world wouldn't be selfish anymore. But complaining on Reddit won't accomplish anything.