Sorry, when I said non helping, I didn't mean that as an offense toward the entire BB community, only the few people I've come across online.
All decent players I've played simply quit after one match because I wasn't good enough. It's super frustrating because Im sure I can learn a LOT just by playing them, without even taking advices. Some even let me do some stuff or let me take a game, and then stomp me -> Astral finish. That's what I call non-helping. And that's why I'm now actually asking for help here, and I'm sure people will be willing to help (otherwise I wouldn't have bothered).
As for the mentoring thing, when you learn anything in life you always start with a teaching of some sort, even in actual fighting sports like boxing, people learn with a coach. This is crucial to correct your mistakes asap and avoid integrating bad habits altogether. I did learn boxing this way, so I know it works for me. Of course you have to be dedicated, do your research and put effort in it. You have to think for yourself and present something. But then you'll need feedback on this something.
I wouldn't have asked if I could play and friend people online all day long. But to play a ranked match on BB you have to pray Jesus that someone will play this game and join your room lol. And when they're good they'll just stomp you and leave.
EDIT: Thanks for the ressources Frost Monarch