Sims 4 cannot be run on a Chromebook, as the game wasn't designed to be run on them. These types of laptops don't have the processor, hard drive space, or dedicated video memory to run games.
Sims 4 is for PC/Mac and PS4/Xbox One.
If you're interested in running a Sims game, you might try The Sims Mobile https://play.google.com/store/apps/details?id=com.ea.gp.simsmobile&hl=en
Chromebooks can not run Windows so it will be impossible to install the Sims 4 on it. You might be able to run the Sims Mobile on it. Visit Play Store to find out.
I'm really ticked off I have wanted the sims for a long time and now I finally have my own Chromebook to do it on and I find out that it doesn't work. this is so dumb.
You should have checked what a Chromebook is capable of. Remember that it basically is a Tablet with a keyboard attached.