Farm will still win out over other things during the early game
^^^^^^^^^^^
Something like 15-20 minion kills equals a champion kill. This is one of the biggest thing new players don't understand. LERN2FARM. Don't focus so much on harassing and killing your lane. FARM.
That's one of the indicator I use to keep myself motivated.
Being 0/3 within 10/15min can bring your morale down, but if you have 120cs and the guy in front 60, you're still in the race.
Also, when you top/mid a lot, you start to see patterns in your gameplay, your building speed and such. When a guy can complete a Brutalizer or Phage without killing you before you have even completed the 2 items that lead to build either, you think twice. That's what happen when I get the chance to play Plat/Diamond guys. Of course they zone the ***out of me (force me to leave the lane when they don't even need it), but they don't even have to, the farming alone would make them win by a huge margin in term of evolution through the game.