That's always how I feel in school. But if you understood everything the first time you read it, you'd probably be a genius. So don't be hard on yourself, note that it's normal to feel that way when you think others might understand something easier. Because they probably feel the same about things that you easily understand and they don't. School/Education isn't just about knowledge. It builds resilience and ebdurance and that that's what you're doing for yourself right now. You can do this! I'm rooting for you!