What Role Should I Play? (the matter is a bit more complicated then just which roles i should play)

Greetings Summoners!

i wanted to create a discussion and talk about something that has been bothering me for 2 years now, now that's something that i personally have not came across in the few years that i've been playing League, and if no one actually didn't talk about this kind of problem, then it could be an opportunity for some to look at things at different perspective.

so the problem is that i don't know which role to play, which role to main, and try to look at this as "finding a the best way to play and maximize my skill" the thing is that makes the whole thing a little bit more complicated, is that i'm good with all roles, really, which is kinda making it hard for me when i go soloq.. its just confusing.. like,

1. which role is the best for carrying?
2. which role will fit me more according to my skills?
3. which role is most beneficial when it comes to practice and difficulty? (in a way that which role is most rewarding if played and masterd)

so yes.. i'm a little bit confused and having difficulties thinking about "maining" certain roles.. i really hope that we could find a way to pick a role that fits skills and benefits by most terms of winning and carrying. i would like to thank everyone who are willing to under go the effort, discuss and help me out and even other people who may struggle like me thanks for everyone taking part in this discussion =)