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
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The closest is 1 teacher of a different class in my grade (not even my own teacher) told my mother I should be tested for autism because of how upset I would get at deviations from plans (again more likely my ADHD).
It kiiiiiiills me when things are different than planned. It makes me super sad or angry when it happens, but it's not an appropriate response so I have to channel it inward.
Does that make me perfect at keeping my own commitments? Oh, heaven's no.