I support the aim of this post wholeheartedly, but not how it was delivered. Let me expound here.
I have played since Open Beta, on the very day of the dual release of Shaco and Poppy, and I learned of the game's existence from a friend who played it in closed beta. As a person completely new to the MOBA experience, and I didn't even play Starcraft, even just being an avid gamer with a general competitive spirit, I was eager to learn all I could about this game before Ranked became even a thing.
YOU THINK YOU ARE READY, BUT YOU ARE NOWHERE NEAR READY
<> You have not played your champion nor champions in your roles enough to understand the importance of knowing specific tidbits of information about different kinds of matchups, how much damage your champion can do when you all-in, when your first power spike is, what a power spike is, technical terms like this, and why you need to know them and how to apply them.
<> Very likely, you don't practice last hitting in bot games, and refuse to do the boring things like this it takes to improve your cs. Read and accept this truth: New players do not gain the gold advantage that experienced players gain because they don't practice last hitting minions. The lane phase and all it entails is much more complex of a monster than you think, and your cs ability is the base of it. If your cs ability isn't very good and your mechanics are, you won't be able to use the micromanagement advantages of being able to cs to help you snowball anyway. I know this sounds like actual homework, but in the end, it's worth the trouble.
<> I tanked my elo down to absolute garbage in Season 1 because my group of friends would constantly do ranked and pigeonhole me into Jungle Amumu - I'm not nor have I ever been good at jungle, and I'm bad at skillshots, but since he's just so tanky, and deals free damage constantly, it's hard to play badly with him. It always has been, but alas, I made the mistake of get this - "Learning every role in-depth through playing ranked" and I haven't even gotten out of Bronze yet. This is from my own unwillingness to accept my mistakes, actively watch my replays, analyze them and really break down what I do wrong in key parts of the game, from extending too far for that one creep, to initiating a teamfight when 2+ of my teammates are clearly OOM or reluctant to commit.
<> Understand that you aren't "stuck in Bronze." Bronze is a community of new and stubborn players who refuse, at some level, to accept their own misgivings and practice what they need to in order to surpass themselves and climb. You aren't in bronze. You are bronze. Whether it's that you play on tilt too much and feed in frustration or other factors, it's likely and I'll go so far as to say it's the main reason that you make up a part of the Bronze division. You may be thinking right now, "What do you know!? You've played since before S1 and you're still effing bronze!" Well you're right to scold and belittle me for this, but you're wrong to ignore what I'm saying just over that fact.
<> Anyone in higher divisions will attest that they admittedly needed to come to certain realizations about their playstyle, game knowledge, decision-making, or some other nuance of their gamplay habits in order to "GIT GUD." You aren't a scrub. Don't see yourself as just "the insert role name here" of your team. You're part of your team, and even though you might be having a bad game and/or your teammates are flaming you over your mistakes, you need to take it with a grain of salt (basically ignore what they're saying) and try to understand why your decisions during a certain situation don't play out the way you had hoped.
<>TL;DR
As a new player, you will encounter players who are simply walls of skill you can't climb over due to your lack of experience and game knowledge. If you practice the basics correctly outside of ranked and constantly strive to increase your game knowledge, you'll truly by ready for ranked at a point when your mind tells you, "Hey, stop playing normals. Clearly you're better than this."
build a 
yesterday and kept it all game despite me trying to point out to him that it was a support healer/shield item.
because I did not understand to combo his abilities (and each by themselves were pretty weak). I also built horribly because I did not have experience (and this was before I read guides). I built spell vamp items on him too. I built attack speed items on 
because I thought with his passive it would make him nearly unkillable. Yes, 1-30 does provide some experience and knowledge, especially if you have played a MOBA before, but it still just scratching the surface when you consider the amount of champions, items and builds.
