You're built to withstand any obstacle.
Think of the hardest thing you've overcame? Did you ever doubt you'd overcome it? Self-doubt can be debilitating. It can deter use from trying or even finishing things. Now, think of how you felt after you accomplished something. Were you relieved or proud? We don't know how true strength until we're faced with the greatest challenge. Self-doubt may may you think you can't do it but there's always a new found strength at the end of it.