It honestly takes a lot of energy to put on a somewhat smiling friendly face and demeanor because if it was accepted (and I know I wouldn't be hated for it) I would go around with a comfortable blank face and a not-as-"friendly/excited" voice--I would use the more monotonous one that requires the least amount of energy for me or not react at all even. Even with family and my closest friends. It wouldn't be personal. This is why when I have low energy like in the mornings I will seem meaner to you or angry. It's just me though, added to the fact that I'm tired. The reason why I exaggerate my reactions and expressions is because I don't want you to feel bad about yourself when I don't visually/verbally/etc. react to whatever you're doing/showing me. I do that because I care about you. (Or I'm trying to blend in to the social scene without being judged as a cold person cause really I'm not- just not outwardly expressive of it) Otherwise, I'm sorry but you aren't worth my effort. It takes a lot out of me.