Don't mistake the work of carrying anxiety in your body for progress on what you're worrying about.
Real, positive change doesn't require stress. Sometimes it comes along with it, but it's not mandatory & certainly not helpful.
Worry without the work doesn't help anyone.
Work without the worry helps—& does so by an order of magnitude more because when you're not stressed out, you can work longer and do better work.
A related tip for volunteering: Lean on your strengths & chill out to be more effective.
Doing what you're good at may feel like "cheating" because it's so easy, but you're giving better, faster results than they would otherwise get.
Making a difference doesn't have to be a strain. In fact, the less of a strain it is, the more likely you are to give.