Donating everything

You should consider that living in such conditions will likely lead to burnout. 

Altruism is a marathon not a sprint. You should focus on having a high impact over your whole career, which will involve not pushing yourself literally as hard as possible all the time. You are only human, regardless of what your ethics say.

That said, there are cases of people living somewhat as you describe and giving a lot of money away - see here

I didn't grow up to donate everything, but I had that goal when I was about your age. My writing from my 20s has some stuff that you might find relevant or useful: http://www.givinggladly.com/

Incredible resolve, Steven. It’s rare to see someone—let alone a 14-year-old—grapple so squarely with how much good a single salary can buy. You’re right: a single $5 k donation to AMF plausibly saves a life, so every extra dollar you push toward the margin matters enormously.

I sometimes feel that EA discussions lean too far toward “Careful, you’ll burn out—dial it back.” Burnout is real, but the analysis often weights personal discomfort as if it were on par with someone else’s entire life. Even if an austere lifestyle shortens a career a bit, the extra years of near-maximal giving you do manage could still dominate the equation. The stakes are that high.

Keep refining the plan, of course—experiment with smaller pledges first, protect your health so you can give longer—but never lose sight of the basic arithmetic that inspired you. The world needs more people willing to do what you’re contemplating. I’m cheering you on.

Thanks for writing this and huge kudos for thinking so deeply about your future at such a young age!

I live on what most would consider little money and can assure you that one can live very happily like that! I however work to help people directly. rather than earning to give away so that's a bit different than your plan. I can see the good that comes from our work every day, while those great people who earn money to give it away are a bit more removed,. Living simply and giving a lot away can be immensely rewarding, though of course challenging due to it being so against societal norms.

There's a book "Strangers Drowning" I would recommend which has some great case studies of people living in fairly extreme ways in line with their strong convictions.

All the best for your next few years of school and ongoing journey thinking about how to do good with your life :).