OK, so first: more stuff than storage always equals a mess. So you need to get rid of some stuff, or get more/better storage. Getting rid of stuff is almost always the better choice.
Also, you’re looking at too big of a picture right now, and it’s overwhelming. Start with the chair that has stuff on it. Clear the stuff off. Maybe wipe down/vacuum the chair. Gaze adoringly at your clean chair. Take a break. Then pick one of the boxes. Deal with the contents of the box. Make the box go bye-bye. Smile smugly at where the box used to be.
One thing at a time. If you look at everything all at once, it seems hopeless. Narrow your view a little bit.
Thank you, so much. I’m going to close my computer right now and clean the chair. And probably the space of floor in...
Try to think this way about home, work, running..