The existence of a perfect being is logically impossible, because perfection cannot lead to imperfection. Otherwise it would not be perfect. So the question should be: are you mad at a devil if they existed. My answer would be yes because there's no justification for the suffering we experience. Pretty much all of my problems were caused by someone or something else and all of the good things I experience were achieved by me.
This means that it is perfect. If God could be imperfect, this would imply defect and not perfection. Perfection is, as Aristotle defines it, that which is neither added nor subtracted (qualitatively). God is the Sumum Bonum.
I am mad at God because here I am in this world I couldn't care less about and yet I have to take myself out of it.
I didn't choose to be here and I have not received any signs as to why I deserve to be here.
I wish God would take me out of this place.
I've always noticed that atheists are always one crisis away from being devout believers...
You didn't searched for them as well. The signs are within intelellect and intellectual framework. There is a lot of metaphysical and philosohical discourse and work engagin' in proving God and its ontic positivity. Just figure out! Parmenides and Eleatics, Thomas Aquinas and the Aristotelian school, Pratyabhijna, Advaita Vedanta and Indian schools, et cetera. I recommend you starting from scratch, try to grasp: Why Materialism is Baloney - Bernardo Kastrup (is about Philosophy of Mind and a sctructural defende of Idealism in Academic terminology).