I've had the same... and been doing therapy for years and feel like I'm 80% recovered.

It's all dopamine, it's probably messed up in your brain. It made you do a lot of things and achieve where you are, but it has too many CPU cycles in your brain for you to lead a (mental) healthy life.

I know the feeling. It isn't about Youtube per-se, but the fact you do this and regret later, so yes, it is an addiction and bad for you.

You likely have a lot of entangled thoughts about yourself, some which are indeed, yours and more of your nature, and also others that are not your own desires.

If you didn't regret it and as you lead a normal life, it's alright.

Why do you regret, is it because you ultimately would like to achieve something big or certain goal, or is it because you envy others sending rockets to space?

Only a professional, a psychologist can help you to find this out.

They can also help you to find ways of breaking apart those habits that take you in front of Youtube, and find new ideas or things you'd really like to do instead, even if they don't lead to immediate dopamine shots.