How do you be confident?

[DanielXY]

If you want to gain confidence, become a volunteer for a humanitarian or environmental organisation. Works like a charm.

Wont that just depress you?

[Main_Brain]

Imagine that in 120 Years they all will be gone.
Helps me.

[problem_child]

Speak from the bottom of your chest, keep your chin up, look people in the eye as if you believe they are not cognisant, don't walk- stride, never smile a little, all smiles must be broad and show lots of teeth, and laugh heartily whenever you think you said something funny. Try to crush peoples hands in less then three seconds whenever you meet and shake.

Never explain.

Do this enough, and as far as everyone is concerened, you are confident.

[problem_child]

or a psycopath, which is kind of the same.