Am I a kafir because of my doubts?

How do I know the difference between doubts and waswaas of shaytaan? In many Islamic websites, doubts and waswaas of shaytaan are two entirely different things. These websites say that Allah will forgive you if you have waswaas of shaytaan, but He will not forgive you for doubts. These websites also say that if you are suffering from waswaas, you are still a muslim. But if you are suffering from doubts, you are a kafir. Read what it says in this website: https://www.al-islam.org/qalbe-saleem-immaculate-conscience-ayatullah-sayyid-abdul-husayn-dastghaib-shirazi/fourth-disease So according to this website, if you have doubt in your heart, you are a kafir and you good deeds are useless. This is what bothers me the most. If you've read my previous posts, I said that I'm suffering from doubts. But most people are telling me that these are all waswaas of shaytaan and I should seek refuge of Allah. Now I'm scared. What if they really are doubts? That means I am a kafir. I don't want to be a kafir. If they really are doubts instead of waswaas, then what should I do? I read a lot about Islam but nothing is helping me.