How can I travel and help people. I have no money.?

I cant really find a decent job to where im not struggling day in and day out. I figure if Im going to be living like this I might as well do something to make a difference for myself and others. I would love to travel abroad and I genuinely do want to help other people. However, i know a lot of organizations that go abroad or in the states(which i would do as well) Make you pay for the trip. Im not looking to get rich or even make decent money doing this. Im just looking for an organization that pays for the trip and living expenses while there. Relocation help would be nice to. Im really not trying to be greedy, as the help i could do over a period of time would be a lot more than what the trip costs. Like if i would get paid 8/hr for 8 of construction everday on the trip, that would more than pay for a ticket b4 long. Any idea how i can fulfill this dream? thanks/