Mayo Connect is a forum for patients and caregivers to support one another. But, even if there was a doctor here, none that I know would render an opinion without seeing you and your images.
Here is an article describing all of the things this might be, and the typical protocol for followup:
https://radiologyinplainenglish.com/ground-glass-nodule-on-ct/
Chances of it being cancer depend on a lot of factors like your status as a smoker or former smoker, and exposure to known carcinogens like asbestos, concrete dust and benzene.

What was the reason for the CT scan?