What occupation/career will allow me to travel and make a difference in the lives of others?

I’m graduating high school in 6 months and I’m taking courses in university involving politics, international relations etc. I have a big desire to both travel and help others positively. I know of a few jobs (medical, politican, aid worker etc) but i’m looking for more options. I’m not too concerned about pay or ‘danger’. I want to know about options that I might not have known about.