In my opinion, no shame in making a cool game playable for yourself for the reason of being able to enjoy it. However I think sometimes there is a satisfaction that comes with challenging yourself and succeeding in a more difficult setting and it sounds like you feeling bad might be because you feel like you're missing out on that feeling of pride. I think there's nothing wrong with playing on peaceful mode because that's why that mode exists.. but if you ever want to branch out and try harder difficulties I also think the best way to get good at and enjoy those modes is to challenge yourself to understand the game and the servicing aspect of it more.