My situation mirrors yours pretty closely. I didn't recognize the symptoms or seek treatment until my mid-30's, but looking back I clearly had ADHD symptoms that became serious around high school.

In my case, my grades plummeted and I was unable to get into the colleges I wanted, or to graduate from an engineering program like I had wanted. I ended up graduating with a degree after 7 years and bouncing between 4 different colleges, and I've had a decently good career in Silicon Valley where being a generalist is a solid plus. But my dreams of being a (literal) astronaut were flushed down the toilet in the process.

Kids shouldn't have to sacrifice their dreams or their self-esteem because parents are unwilling or unable to seek proper treatment.