Envying "cool adults"

When i was a kid i always looked up to the cool adults, by "cool adults" i mean people who have their rooms filled with posters, cd's, vinyls, having creative skills, great friends and stuff. I always wanted to be like them and in my head, my future self was like them as well. It took me years to become one of them too, but i'm realizing this just now.

I met a girl who's the same age as my brother 2 years ago, i call her my sister now since we grew kind of a elder sibling/younger sibling relationship. I wasn't even aware that i have become a "cool adult" until she mentioned how much she envies me and wants to be like me. Which made me... proud. A lot.

But also weird.

Don't get me wrong, i'm grateful for who i am, it was just weird to not realizing it on my own. Probably because i forgot that dream, but most important factory was my family, friends etc. There are people who can make you feel self conscious about your appearance, personality, everything. My surroundings were filled with these people too, making me ashamed of who i am for years until i start college and cut the ties with them (though there are still people like them in college as well and it's almost impossible to cut the ones from your family).

That made me realize something else as well. I am my own person. I'm studying my dream major, have so many cd's, a vintage cd player and even a vinyl, i have now guitar and ukulele as well, which was impossible for my child self because my dad was too strict against instruments. Why am i self conscious then? Why should i let people that i hate make me feel that way? I became my child self's dream person, i must feel proud, because i did it.

Yes, not everything's perfect in my life, i have flaws and i keep doing mistakes but isn't it the law of the real life?

I should be grateful, not "you're ungrateful for not being happy" type though, realizing the things i have and be happy type would be better.

Maybe i couldn't word it good, but you got the point.