I am not afraid…I was born to do this. ~ Joan of Arc
The mindset is that you will write come hell or high water. You pen stories whether you expect to publish or not, but you know in your heart that you will do so anyway. Because you won't stop until you are.
When you feel you are born to do a task, pursue a goal, or become a professional, you do not fear rejection. Instead, you revere it. You use it to measure the advancement of your ability. Without criticism, you languish, unsure of your performance. And you don't want just any criticism. You want feedback from those who have excelled before you. You crave mentors. You want clear assurance that you are climbing the ladder.
Delay irritates you. Other events in your day that steal your time, frustrate you. Contests, critiques, editors and publishers beckon like coke to an addict. If you don't write, you feel like a marathon runner with a twisted ankle, chomping at the bit to get back to it.
If you find yourself "trying out" writing, or "getting to" writing, instead of making time to write in spite of the rest of the world's agenda, then you might ask yourself is this what you were born to do. Everyone deserves to possess such a mission - a task he was born to do. If writing isn't it, then find what is, because it makes your life phenomenally richer.