When you give to others you make the world a better place. If you develop a more selfless attitude, you will erase fear, and doubt in yourself. There are different ways to help people. Try to find the most productive. Choose a method which will be more compatible to how they think you can help them, instead of what you think they need.
Humanitarian deeds can be the source of great happiness.
In fact, the world needs you to succeed. The competition in the world is no longer 'dog eat dog'. There is a higher level of civilization, and it requires everyone to do his or her part. We're all on the same side. Greet people with respect.