Xarcell you will need go get back into fastboot mode for any of this to work. Try holding power + volume down for a long time until you get there (after turning it off with the method de0u described.
This should calm you down first which is most important in your situation. You most likely didn't break your 600$ device, don't worry!
Now you really need to find a solution for the installation machine as your Chromebook and Pixel 2 likely won't do the job.
I recommend finding a family member, friend or colleague with a somewhat modern Android phone and ask them to lend it to you for an hour. My experience is best when installing from Android devices, because you don't need to install any adb drivers first (which might be tricky to convince someone to do on their machine).
Good luck and let us know whether you succeeded.