Lets see:
Go 17-3-12 as Riven, get super farmed, own my lane and win the game in 40 min. Teammates were all good, although the jungler (AP WW?) did badly at first.

NEXT GAME
Go 2-3-0 as Riven, get some farm, remain unable to push out Nasus, and when I'm about to Fiddlesticks shows up. Now I'm sitting in a 2v1 needing to b. I ask WW to cover for me. He said nothing and went on killing Red. Fiddle walks into a bush, ults out and kills me. Vayne was ****ing korean, sork couldnt do anything with vayne being challenged mentally, WW only ganked mid once, Malz lost to Xerath and we surrendered at 20.

What the **** is this Riot. Do you enjoy FORCING players to lose games? Shouldnt I be matched against people above my skill level to fight, thus testing my abilities? NOPE. GOTTA PUT YOU WITH 4 ******* AND EXPECT YOU TO CARRY THEM.
Edit: This WW also rushed a ****ing BLOODTHIRSTER
**** you Riot, just **** you.

What is a team and how do I get one?

Maybe don't play Riven so much.

I speculate why your team lost. You took Riven solo top, had no jungle tank and got raped in team fights late because you had no initiation and CC.

AMIRITE?

Meh. Better than having a d/c and playing 5v4 the whole game.