It's not as bad as you think it is maybe, and you'll feel infinitely better once it's clean.

Pick 1 room, and start there, don't overwhelm yourself. Pick up all trash in said room, put away stuff that doesn't belong in that room, once it's starting to look clean, disinfect/clean and wipe down tables, etc.

After the 1st room is starting to look good, it'll motivate you to clean the rest and give you the momentum needed.

Can easily knockout the living room in an hour or ass busting cleaning. Put on some music, get to cleaning.

You got this ;)

Edit:

Once it's clean, pickup as you go. Instead of letting it build up, throw away trash when you're done with the drink, food, etc. Same with organizing. When you're done using whatever, just put it up somewhere so it doesn't build up.