One of the things I have learnt is having a target of something. What you did yesterday will be different today and that's Growth. And also venture into Journaling.
You should look back on your embarrassing past selves with an urge to wrap them up in the most comforting hug imaginable, not with condescending resentment
Confidence doesn't come from believing in yourself. It comes from having done the uncomfortable thing enough times that your nervous system stops flagging it as an emergency. Because nothing is actually hard, it's just unfamiliar.