I was diagnosed with ADHD and started on medication at 12, but not really told anything about what it meant for me or how to deal with it, and when I was 18 -literally when my parents dropped me off at college- was told I was autistic
Edit: don't forget to upvote posts here so they're more visible and people can find the community!
See my quick outline here for mushrooms. If it's DMT you're more interested in, can't go wrong with this starting point (though if you've got no previous experience or limited previous experience with psychedelics, do not start with DMT).