if you could change one thing about yourself , what would you change ? why ?

i'd change the way i act towards people, because sometimes when im in a bad mood and someone trys to talk to me i'd take it out on them and then we'd end up arguing or something. and i'd change the way how im very quick to assume ! like SOME people should change about them too . because thats like my worst habit and i know how other people feel and crap. theres quite a few things i'd change but i doubt it'll change.