You don’t have to change the world to be a hero. That is too much stress for one person. Start with something small. Just change yourself. To realize one fault of your own is better than to realize 1000 faults of someone else’s. You may not be able save the world, but you can at least change yourself.
Nobody is perfect, so there is always room to improve. Keep striving for perfection. Be a better person to others. Be a better person to yourself. Share the love. Gain knowledge. Bring wisdom to the world.
Start with yourself, and then maybe one day you will be able to save the world all by yourself.