>How do I gain things like discipline, self-confidence and inner strength?
You start by forgetting about these bullshit terms and setting S.M.A.R.T. goals. You don't want "discipline, confidence, and inner strength" you want what they give. You don't want "discipline" you want to GTFO 8ch, so do just that.
You don't want self-confidence, you want a good appearance/social ability so work on that.
So an and so forth. Work on your real problems and you'll find that these abstract as fuck things will come.