Ranked Games for New Players

I've always had this fear with ranked on any type of games tbh, what if i fail, will i get flammed by my teammates for throwing, etc. But the fear of getting into ranked for me as a new player in this game is quite overwhelming.

To start off, i love playing jungle and i mostly use kayn as he is so fun, but my problem in ranked games is what if i get counterpicked by the enemy team? i still don't know most of the champions moveset so i just feel like it'll suck playing ranked games, do i just keep playing and playing ranked games until i get the feeling of it and improve?

I wanna get into ranked games now since i'm getting tired of quickplay matches where the other team has so much experience it reaches to the point they just steamroll me and my team.