A few resources which you may want to check out, in roughly increasing order of difficulty:

- Free Code Camp: https://www.freecodecamp.org/

- CS50: https://cs50.harvard.edu/x/2023/

- How to Design Programs (HTDP): https://htdp.org/

- Nand2Tetris: https://www.nand2tetris.org/

These are geared towards making you a better programmer in general, though it won't necessarily bring you closer to an AI/ML career.

Also, math is pretty important if you want to get into AI and similar things. Even otherwise math is important; don't listen to people who say you can get by without the math! So, try to get a head start on probability, calculus, linear algebra etc.

Good luck!

Gosh, I'm embarrassed about what I was up to when I was 16.