You don't take action because you don't believe in yourself.

When a belief is formed, it is immediately transmuted into action.

Here's the golden part - the more action you take, the more you tell your subconscious: "I believe!"

Here's how you can speed up the process...

From now on, every time you take action tell yourself: "I'm doing _____ because I believe in myself."

The word 'because' also has great influence on your subconscious.

Whatever comes after the word 'because' automatically seems logical with little to no mental resistance.

When you finish running, say: "I'm running because I believe in myself."

When you finish working, say: "I'm working because I believe in myself"

When you eat healthy food say: "I'm eating healthy because I believe in myself."

Train yourself to believe in hard work, the actions you take, and strengthen it's effect on your belief system.

More action -> stronger belief.
Stronger belief -> more action.

It's an upward spiral.

When you achieve a state of absolute belief, you'll do everything in your ability to achieve your goal in the best way and have fun while doing it.

Practice it daily & you'll get there.