I accept voluntary labour
The NGO type work is one of those businesses were its who you know, not what you know. Very few of them accept 'volunteers' believe it or not as it is too difficult to manage them, house etc, cheaper to actually pay locals most of the time.
The only real volunteers I have come across are those connected with church groups, that sort of thing. Even then they expect you to put yourself on a plane and get there, you will normally be housed with a local 'well to do' family (<not the standard you would expect in the UK btw).
Can I ask how old you are and how long you're prepared to volunteer for?