There's so much in here already about confidence. If all those tutorials and tips don't help you, then no amount of tutorial and tips will.

You just have to be confident and stop asking "how"? It reminds me of all the people who say "how do you stop procrastinating", to which the obvious answer is "just fucking stop!". Don't look for excuses as to why you're not confident, just be confident, act confident, TADA.

Christ.