Google Drive, drive full, can not find files

I have 99% full, No photos in Google Photos
No Trash
Where are these files?
How do I see / find them ?

Gmail... deleted trash
Others have shared their drive, I have uploaded to their drive, are these now mine too?
Thanks

Where are you seeing the FULL message?? Is it within the Email Program or the DRIVE APP??

Some screen shots included
Storage Image
...Black circle...we are looking at
Light blue...shared folder...I am not my drive
Purple...I am the owner

If not on my Drive, I am the owner, whose space is it ?

I'm pretty certain it is counting ALL the folders in this screenshot.