Whats the deal with matchmaking?

I more often than not win lane. the laning phase of the game is quite trivial most of the time. Every so often i have a bad game and feed my a** off but rarely. the mid to late game rolls around and often consists of me joining my team to find that 3 out of the 4 or 4 out of 4 other roles couldn't handle their position and proceed to drag me into their loss. I'm not getting what i'm doing wrong. I have been playing much more serious this season but cant climb. This is a problem. The matchmaking. i'm getting matched with players that lose lane too often and it isn't fair. just because i cant hyper carry my team doesn't mean i should be forced into a league that i don't belong in. I think its a fat issue and i'm fearing i'll give up on league after getting placed with fresh level 30s that don't understand the concept of kiting. Thank you for your time Sincerely, an unhappy summoner.