I want to fix everything. How to do this?

It continues to bother me every day that we live in a world where billions of people do not have access to clean water, adequate nutrition, health care, or education, yet I am getting a completely self-indulgent education in something that I love that helps solve none of these problems. I have a great deal of disdain for wealthy people who spend thousands of dollars on purses etc. but this is really no different from my willingness to pay $4.00 for a latte. I am a big walking hypocrite. So I have a couple questions:

1. How do you personally resolve the conflict that the world is filled with suffering and many of us do little to alleviate it? (I mean this as a serious question although I realize how self-righteous it sounds.)
2. Do these basic human rights problems have solutions?
3. If so, what are they?
4. How to contribute to these solutions?