THE ONLY ANTIDOTE IS ACTION.
Not mistaking, fear can be good. There is a reason why it is possible that we get scared. Fear helps us not to act irrationally but calculatively.
There are times when we are sleeping at night and we hear sounds like footsteps outside, automatically we become fully awake and energetic at the moment, because of fear.
It is a chemical our body releases which makes us alert and is designed to keep us safe. But fear is not so necessary sometimes.
If you do not take care, fear will keep you at your safe zone or comfort zones. There are many things we would like to do, but fear restricts us.
Fear makes us complain, procrastinate, and believe little of yourself. The only antidote to this is action. Funny enough we humans know the right things to do but we give reasons not to do them.
You want to contest for a post, you fear you may fail but you know what, failure is good. If you don't try you won't even fail. You don't just rush into the contest, instead you take action and meet with people that would increase your chances of succeeding.
First you have to decide to do it, then you take the good, and calculated action.