Ask yourself the question of whether you've got the put the work in, got the knowledge and got the story and if you have then you should be confident in your worth.
As you build it's important to know your worth. No one else will know this other than you.
If you're not confident in your worth then find out if you're lacking in knowledge or experience then you're like to have a battle with yourself.
Once you know your value then don't doubt yourself or let your mind wonder, don't sabotage yourself by doubting your worth.