I'm studying physics in college, but I usually have a problem with coming up with questions during lecture, discussion, office hours and even when I am reading a textbook or working on a problem. I don't know what's wrong with me but I just sit there pretty content while learning while other people ask questions every 10 min that are really good that I hadn't thought about or point out errors I'd look over. I would maybe have one or two questions every month that I would even bother to ask the professor (and even then I could just look it up in the book). To better explain this there was an example in my intro to quantum mechanics class where we had some function that was inversely proportional to the momentum of the particle (i.e. f(p) ∝ 1/p). I sat there pretty chill and then a student asked what would happen if the velocity was zero. I felt like the most stupid person in the room for not even considering something as simple as that. I know this is just one example but this happens pretty much every STEM lecture I go to and every time I read a book and I feel like a dunce. I know this is kind of vague in exactly what I want but I just feel that I am not thinking critically enough inside and outside the classroom and its affecting my proper understanding of the material. Any tips?