Tried counting calories for what I wanted to eat for lunch, now Im confused and not hungry anymore?

Title says it all, Im in the kitchen deciding what I want, checking Lose It! and seeing what has (x amount of calories) and now Im frustrated and not hungry anymore, Im not sure why, Am I overreacting? Am I likely trying to justify eating even though Im not overly hungry but will get hungry soon?

Btw I am new to counting calories and its really overwhelming for me rn to look at it and go okay so I have this much I can eat and trying to come up with healthy options to eat and all that lovely stuff