How do you stop being nostalgic and focus on building a better future instead?

If you just look at your feet take one step at a time, pretty soon you’ll look up and find yourself at your destination.

Don’t worry about the past or the future, worry about you, now.

Build a good life for yourself, and contribute what you can to a better future. If your sole mission is to build “a better future”, you’ll live and die without ever achieving it.