Is it normal to struggle with grammar?
Yep.Totally normal
Yes. Grammar trips up plenty of people, and struggling with it doesn’t mean you’re unintelligent or bad at communicating.
Grammar can be tricky because English is full of exceptions, and a lot depends on what you were taught, how much you read and write, and whether you’re using more than one language. Even people who write for work make mistakes or have to look things up.