I don't feel I have to be someone I'm not to get people to like me, because quite frankly, I couldn't give a damn if people don't like me.
But, I do behave differently with different people and situations. I think to some degree that's quite normal and most people adapt to suit a situation, for example - you're unlikely to behave the same way at work as if you were on a night out. But I have found I seem to completely change at times. But not purposely so people like me.