Fact #1:

If you ask people whether they know how to swim or not, a large group of them say: "Yes, of course!".

Fact #2:

Ask the same group, if they have seen themselves while swimming (surely the taken movie or photos is my point! :D), I am afraid even one-third of them have a positive answer!

Q&A:

Does it really matter? Yes, it does. Do it, you'll get the point :D
To save up your time, the feeling is quite the same as a fish, watching itself out of water world.

Conclusion:

Each person has a picture of himself in his mind. Every pixel of that has been visualized from the same perspective which might be wrong!

Advice:

Once in a while, give ourselves the chance to redraw our made portrait, but at the position of an outer observer!