feeling emotional/overstimulated

in the recent academic year, i started becoming overstimulated very easily and cannot stand loud environments anymore. im also an emotional person, but its been out of control as well. i also cry extremely easily. when im sad, angry, happy and touched. i think i feel things too much, and its affecting my relationship with my friends, as they dont understand where im coming from when im sad. im also a little slower than my peers in class, and struggle to find motivation to do my work… what does this mean? please help