I always become somebody else

whenever i see someone in real life or movies, i imagine i have become like them. i start thinking how i perceive they are thinkin, act like them, etc. and after sometime when i see somebody else, i change and become like him. also when i see people with bad or defective qualities, i start familiarising myself with them. i become afraid i'm like them though i might not be actually and eventually start acting like them and deveop unwanted habits. i used to get lot of attention from girls though i always felt unworthy of it and get very anxious.