Feeling like a failure after every lecture

Hey, just gotta get something off my chest as a new lecturer. Is it normal to feel like I'm failing after every lecture? Even if I prepared so much about the lecture, but still, I feel like I am not doing enough. I feel bad for the students. It bothers me when they nod in agreement, but I'm unsure if they truly understand what I'm conveying.

I'm still struggling with the course content since it's my first time teaching it. Plus, I'm probably too hard on myself about how the students perceive me. Last time, I heard some whispers like, 'This is the... class,' but it was kinda unclear. Are they saying it's the worst class? Ugh, I just feel terrible. Will this get better?

Please, I need some positive words

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Dear everyone, thank you very much for the positive replies and suggestions. Truly appreciate 😌👍