Is this a personality disorder or something...,?

usually im a very strong hearted smart person, the type people turn to for advice.... and at other times i find myself deciding hmmm i really like this guy, hes quiet and likes rock music, so ill ACT like im a quiet rocker too and ill put on that front until he is gone... then the next day me and my fiancee will fight and ill thiknk to myself.. maybe im not his type, maybe im too loud and aggresive let me try to be more quiet and innocent, and ill put on that front until i eventually forget about it... i do it ALL the time and im wondering if anyone else does this or has an idea whats causing this? i have self esteem i think im cute and everyone likes me, i just question my personality