The world is full of so much need and injustice, it can quite literally become incredibly overwhelming, and that "throw your hands in the air" mentality is often the more appealing choice.
But then you discover a site like the one below and you are both empowered and compelled to act. The sin of doing nothing is one I fear the most. But being ill-informed can render your "doing" ineffective, no matter how much your heart is in it.
Do yourself a favour and have a look at this site. Look at the areas on the world map that have the greatest need. Pick one that is feasible for you - go to the 'Act' section - pick an area where you can contribute or create. And go. Do. Not tomorrow. Now. But do, informed. Then you will do great.