Not feeling confident with retaining information

I don't know if I'm just overthinking everything, but I struggle to retain information easily when it comes to IT. I use Quizlet to study over my terms, but I feel like I'm not smart enough for it. Not gonna lie, I love what I'm majoring in, but I have this urge to feel like I need to remember everything. Any advice for not beating myself up for not remembering every single term in the book?

cybersecurity don information love retain smart study terms