Why is is so difficult to act like ourself?

Being a part of the Production Team at Palm Valley, I am able to experience different areas of production which range from helping out back stage, behind the scenes, acting onstage or video.

Yesterday we filmed a segment for the 5 til. (which is our video announcements for the week) Some weeks we are able to film creative quirky little commercials, and some weeks the commercials lean more towards the informative, transferring of information side of things.

During the informative filming, I realized, It it much easier to act like someone else rather than ourself. Why is that?

When it comes to preforming, it is much easier to have someone critique a character, rather than, well you.

I wonder, when does that get easier?