Volunteering abroad

Me and my friend are trying to raise money to allow us to go on a 2 or 3 week volunteering project abroad. We want to work in a childrens hospital or orphanage in either Asia or Africa. This will be an amazing opportunity for us allowing us to help others, gain confidence and its a great life experience. We both want to becomce doctors in the future so it will help us with out carrer too. Any amount of money you could spare would be amazing. Thanks so much!