Can adults no longer have feelings?

Today I completely messed up, i was supposed to observe a kindergarten classroom for my education college class but i apparently didn't do it right, they said the whole thing was unsuccessful and that i will have to try better next time, but i personally don't think it was, I observed the children in different situations and how they reacted to me being there, which is what i thought i should do, and then one of them was talking to me and said i was really nice as if the adults around them aren't as kind? when i got home and ended up crying thinking that there is something wrong with me, I’m never good enough for anything, they were all chewing me out instead of also pointing out and focusing on my good qualities, I just wonder is this what a adult is??? Someone who should just forget their emotions and pretend to never have them, i just don't know what to do anymore.