I’m a senior in high school. I’ve been aware of EA since 2022, but only really gotten more involved in the last 6 months (went to EAG).
My background is in ops/entrepreneurshp (organized hackathons for HS students) and software engineering (web dev and systems, multiple internships). I’m also a top Quizbowl player in my area, meaning that I have experience in learning large amounts of information (history).
I second Nathan’s answer, but besides that here are a few programs specifically for HS students you might be interested in.
SPARC (deadline closed for this year)
ESPR
PAIR
Non-Trivial
I’d also recommend applying to those university programs! When I was talking with the organizers of those programs at EAG, n=3 seemed to believe it’d be perfectly appropriate for me to apply. I suspect other programs would also (major caveat: may only apply to non-residential programs for <18 for legal reasons).
(also, Yarrow B’s answer is a joke, but, anecdotally, a major failure mode of young EAs are becoming too dedicated and sacrificing all their other interests and such for it. )