Advice to win more games

Today I was playing a game and I was being destroyed as Riven top by a Darius. Long story short, after the 3rd death in a row, I was tilted. A lot. And at that point, I just remembered the piece of advice I had heard so many times and I had watched so many videos about. In fact, I could remember that advice all along, but it was at that moment that I really thought I should follow it. Don't. Tilt. By then, Darius had beat me in everything - farmwise and killwise. So I relaxed entirely, and thought to myself I'd be as concentrated as possible and try to outplay him. Surely enough, I did. Having asked for a little help from the jungler, I managed to get a kill on him. Then I farmed, and farmed. I ended up with a score of 11/4/13 and 238 farm. And I got the 4 deaths before getting any kills. In conclusion, when you're having these moments of "We'll lose for sure", "We can't win", "Surr at 20", etc, just try to relax for a second and play the best way you can. Don't feel tilted at all, it's hard, but if you put your mind into it, you can make it happen. Just for a reference, the score was 4 - 20 at some point. 3 of my teammates wanted to surrender, but I and someone else didn't. The game ended 35 - 33.