Here's why people tell you that "it's just a normal, chill out"
Just because you want to try-hard doesn't mean I want to try-hard. I'm playing to have fun for myself, not to have fun for you.
These are what the people telling you "it's just a normal" are saying. You probably said something try-hard as hell, and they told you to "calm down, it's just a normal".
And you know what? It is a normal, and sometimes when I'm playing a normal I'm not practicing, I'm doing something fun because I DON'T want to try-hard, and so I'm not worried about winning or losing as long as I had fun.
Besides, winning or losing is not a gauge of your personal skill, it's a gauge of how the team played, and the sooner you realize that, the sooner you can focus on improving YOUR playing, the wins will come afterwards. There's way's to mitigate everything in the game, wards, communication, and creeping well, and the sooner you take precautions, the less you will die.
Play smarter, not harder, League of Legends is about information and strategy, not merely skill and mechanics.
Also, know that normals are for fun, and ranked is for competitive. That's why if you look at any Pro Player, you don't see any normals on their match histories, it's because they practice like real players should, in ranked.