Recently I suspected I had covid because I kept accidentally coughing.
That's horrible, do you think anyone got it from you?
Some people started coughing and having shortness of breath
It is not good to not be careful when you are sick. It can actually be considered assault if you do it to somebody's face. Then you will be in jail sick with COVID.
I'm not going to jail. It's fine because I learned that COVID is fake anyway.
Obviously it's not fake, and what you're doing to these people is extremely ignorant. If you suspect you have a major illness like that you need to stay at home and quarantine till you feel better.