Confidence is like a muscle. You have to build it up slowly. Do things daily to strengthen and practice.  Watch how others do it, but know that you might do it a little differently than them, keep training, and don’t get too discouraged when progress is slow.  Stretch yourself slowly, but don’t push it too hard.  Understand that it might even hurt a little at first.  But keep at it.  And give yourself credit when you make even the tiniest bit of progress.   It will get easier, but it is still just really really hard.  But don’t quit.  Ever.  You owe it to you.