[jamesliudotcc]

Maybe your problem is Stewart? I used that textbook and was successful, but it's not for everyone. For example, beginning calculus with limits is another bit of misguided conventional wisdom. I still don't get limits, really. Serge Lang's calculus book takes the approach to just roll with an intuitive notion of limits, saving rigor for analysis. Which seems better.

Gilbert Strang has a textbook, also more intuitive and applied. Free PDF provided by MIT. Sylvanus Thompson's book is recommended here, again, intuitive, applied.

Other comments here, 3 hours isn't enough, use Math Academy, nobody gets it on the first approach, all seem relevant. One of the textbooks recommended here says in the preface that it's for a second course in Linear Algebra. Analysis is just calculus the second (or third) go round, and it's said to be the hardest class in a math major.

I am in your boat, but about linear algebra instead of calculus. This is what I try to get myself over the hump.