Try this. Put a glass of milk on a table. Decide to drink it. Have a positive attitude. Know that you can drink it. Read some quotes. Speak aloud, some positive affirmations. Smile. The milk is still in the glass, on the table.
It takes action, body movement, to drink the glass of milk.
Speaking of quotes, I like this:
“Action is a great restorer & builder of confidence. Inaction is not only the result, but the cause, of fear. Perhaps yours actions will be successful; perhaps different actions will have to follow. But any action is better than no action at all.” Norman Vincent Peale