I can relate to that feeling for my own part as I am someone who needs to constantly be “on the go” so taking a day off or having a light day can feel quite frustrating, especially if I think I’ve got a lot of energy leftover.
A perspective that has helped me is something from this website (possibly from Steve or Scott): “Training is not the work that you do, it is the effect that it has on your body”. It’s important to accept that rest/recovery days are necessary so you are able to consistently do the hard workouts without overexerting or injuring yourself.
It also reminds me that the rest/recovery days are when your body is actually “improving” (even if it feels like I’m being lazy!) because that’s when it is repairing itself for the next effort. It’s important to look at things in the round and not get too wrapped up in the mindset of “I need to work harder” because the hard work won’t have the impact you want if you don’t take the time to let your body chill out.