like walking on eggshells

Like walking on eggshells is a way to show you are acting in a certain way in order to avoid upsetting someone. Eggshells are very delicate and extremely easy to break which also makes a loud noise so if you are feeling like you are walking on eggshells, you are describing a way to act and go about your day where you feel like everything you do or say should remain delicate and be very careful not to upset someone.