Is there any way for me to control that only my authorized users will see and fill the form?

I can see on the forum that some accounts have been suspended for creating a login page, and I understand that you don't allow to capture user credentials. But I cannot have the forms I plan to create in jotform to be accessed or seen by everybody on the internet. Is there any way for me to control that only my authorized users will see and fill the form?

Yes, we have a feature called Assign Form

It can be done by going to the PUBLISH tab

Then to SETTINGS, to set the form as PRIVATE

Here are some guides that explain in detail this feature:

https://www.jotform.com/help/chapter-53-assign-forms?&&entrymessage=892245969