Need advice from seasoned summoners

Hello Summoners,

First off... If I placed this on the wrong board, I apologize, mods please move to the appropriate board.

I started playing LOL 3 weeks ago and started to really like this game. I got to level 30, played my placement matches and landed B1. I play sup as I am not very confident playing the other roles. If I get bored I play top or mid, but that's once in a blue moon. During Ranked games, I give way to more seasoned players and let them play carry, and just play support, which I don't mind. But as I kept playing solo, I saw how inexperienced I am. I get ganked a lot, don't know when to start a fight, when to back out, which I know is all part of learning. I play Thresh, Naut, Blitz, Sona, and Leona. Mostly Sona and thresh. But aside from the inexperience, I see that my team mates (the carries) are either also inexperienced or doesn't help well so we end up loosing. Now I am at the very bottom wondering how to get back up.

My question is, should I give up on support and start playing top (the position I am confortable playing with aside from sup)? Or just keep on grinding sup until I improve, or get lucky and find a better team?

Thank you all!