I feel guilty for wanting to buy things when there are people starving, help?

everytime I want to buy something I just remember that there are starving people all over the world and that my money could probably save their lives. for those who have seen it, there's a scene at the end of schindler's list (the film) where he's realised all the things he could've sold (his gold badge, etc) that would have saved more lives. I feel incredibly guilty for wanting to buy things now, what can I do!