Because you need to get to the interview stage AND seem good during it
Here is how the hiring process works from the end of the people on the committee:
1. Get all the CVs. Let's say this is either an entry level position or a particularly good one and say we have 100 CVs
2. We break it up into groups with each CV looked at by at least two people
3. If there is not an applicable degree, it is almost instantly binned. The only exception is if they have a fair amount of experience (at least 1 year of contiguous work on a related project for an entry level position) or are otherwise exceptional.
4. We continue to filter and iterate until we have it down to about 10 applicants. We have yet to really talk to anyone as part of the hiring process and are solely reading papers and looking at them based on their CV.
5. Then we do phone interviews where it is about seeing if they sound remotely competent and would potentially be a decent fit. And if there was any question about you making it through the filters, expect it to be brought up
6. For the last few (let's say 5) we'll do an actual in-person interview with whiteboard coding exercises and lots of discussion.
You don't have a degree. Bachelor's is bare minimum, but we prefer at least a Master's. You are in the bin. You didn't invent sliced bread, you are really in the bin.
Maybe you are the smartest person in the world, maybe you are a really earnest kid, and maybe you are someone we could never have worked with in the first place. We'll never know because you won't get past the initial filtering.
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In short: Finish HS and at least get a community college Bachelor's degree. And if you are truly hellbent on not getting an education (a red flag, by the way, since it suggests you'll clash with people), start making the greatest project ever.