You can't go into LoL thinkin you will win every game... even in ranked its not about winning, It's just about getting better. Make a mistake... cool don't make it next time! When you think about what ranked is and why its taken so serious it's sorta funny. Ranked is literally the same exact game as draft... but some fictional currency is on the line, so people are a bit too serious from time to time over winning in ranked. You're rank does not matter and it never will, so don't let ranked make the game not fun for you. All that matters is that you enjoy the game! Your teammates will feed sometimes and there really isn't shit you can do about it. One Person can absolutely lose an entire lol game for a team so when it happens don't get to hung up on it.
Just do your best and try to not be "That guy" you know the one flaming in all chat instead of farming up because hes 4 kills down? Some how each and every one of his deaths is not their fault. As long as you can avoid that situation you are all good. After all most of us are not ever going to be in the LCS and most of us will never get paid to play LoL because we suck... so why do we act like we are Faker?