Doing the Right Things
Don't ever feel foolish for believing in yourself, even if something didn't work out. Nobody walks perfectly on the first try.
Don't ever feel foolish for believing in someone you loved, even if it turns out they were lying or not worth the effort. You couldn't have known that ahead of time and you did nothing wrong.
You're doing the right things.
Disappointment hurts, sometimes a ton, but you are adding good to the world and that's worth a lot.
Always remember that and keep on being you.