Social Justice?

Anonymous I've been thinking a lot lately about social justice. This topic has been something that I've been concerned about for quite a long time, but trying to place it in the context of a new country has been difficult. I believe strongly in the importance of caring for the poor and the oppressed, and yet I feel the need to look the other way when beggars come up to me asking for change. I ask myself if the forlorn children who come up to my table while I'm eating lunch were sent by someone; if this is just a scam. I keep walking when I see homeless people curled up on doorsteps like the dogs. How can I advocate for social justice and yet pay no mind to these people in need? Does this make me a hypocrite? I want to do something to help, but I don't know how I can.