I feel like you're asking me to understand where you live, what your skills are, and how you can leverage your abilities to help people. I obviously can't and it's not always obvious for people to understand how to figure that stuff out on their own. This is part of the problem with service being an inconsequential part of American culture - there's no "social infrastructure" to identify who needs help and set them up with people who can help them (that aren't, explicitly, social services).
I'm less concerned that teenagers are "inspired with empathy" than I am that we as a country have a large group of young people to put to positive social use. A good friend of mine is German. His 'voluntary social year' was to drive an ambulance. I don't care if they are trail building or helping immigrants learn English - having them to engage in social service will help build a culture of service and get some important (but perhaps, unprofitable) work done.
I'd say this: if you feel like this is something you want to do then just start trying some things.
Organizations that work with youth are super familiar with people showing up all jazzed to do something, then dropping out after a few weeks. Just get out there and try some different things. Sure, it's kinda crappy to do that - but if you don't get yourself into a few different rooms with a few different kinds of people then it's going to be hard to find something that works for you.
Second, your presence and effort and compassion will matter more than your wealth. In fact, I don't even know why your wealth should be relevant. Dress down, buy a Casio, downplay your job - whatever. Say "I do boring computer stuff; nothing fancy like Facebook or Google" even if that's true. If you're working with kids they are going to want to know stuff about you, but you should always choose how (and how much) you share.
Finally, I work in a service oriented job and there are a regularly days that I drive home feeling burned out/abused/ignored. People can be ungrateful and greedy, but - that's not the point of doing this kind of work. I do it because I believe it matters and makes the lives of young people better. Find your reason that doesn't rely on gratitude (because you're guaranteed not to always get it).