Interesting, honestly, yes to both.
A sociopath I know, is kind looking, "caring" and often changes her personality so that those she is with will like her. Lying was everything, ever little thing was a cold pure lie. She would take drugs just because everyone else was. She would tell you all the things you wanted to hear but really weren't the best. She would go behind your back and hate on everybody. Sometimes when drunk she would scare me a bit, it threw me off, like I could see the evilness coming out. She was horrible to her partners, she never even liked them.

She even admitted she tries really hard, and nobody knows who she really is.. neither does she.