Why's everyone around me changing?

Most of my close friends are changing.. They're just not themselves.. Why?! Recently, I'm having so many problems.. I won't mention any names here.. But, why is this happening so frequently? What have I done wrong? Can someone tell me please? I'm losing them all ): Really dunno what's going on.. Maybe not only myself facing the same problem.. Someone close to me also facing the same thing.. ):

Anyway, bye..