Worry about shirk

One day l was praying salat bad thoughts came to me. Somehow didn't repelled them. And l started to think about the by myself. And l have a question a we accountable for what l say in my mind. I think I said something bad in my mind but l don't know if l moved my tongue or lips Please help l feel so sad and guilty l already ask allah for forgiveness and said the Sahada again the thing this happens over and over again . I still pray salat. Is my salat accepted and am l still muslim. I NEed to know if l committed or if talking to myself about bad thoughts doesn't impact me. And will allah punish me.