Tilting...even when it isn't necessary.

So to start off, I've been playing League for about a year now. I did my first season recently and got placed Silver 3. I'm a main through and through (enjoyed playing him since I started, really love his character and lore, etc.) and Top lane is my favorite position, but I like trying out different champions and lanes and learning how they work ( and are some of my other favorites). I'm mostly a casual player since I much prefer playing Normal Draft games with friends as opposed to building my rank up, though I'm constantly striving to get better at the game and would love to continue Ranked in the future, especially next season.

Something has been bugging me a lot though as I play, and this is more from me as a player rather than players that I see in regular games. I've noticed that I've been prone to tilting during a large majority of my games, even in situations that really don't warrant being tilted. It mainly happens to me whenever something extremely small happens during the game, such as getting killed, getting zoned off of CS, being harassed or poked in lane, being camped, etc.. When it happens, I get extremely mad at myself, constantly blaming myself, calling myself stupid, telling myself I shouldn't have let that happened. As the game goes on though, I still retain this way of thinking, even when I attempt to calm down or the game starts going more in my team's favor. I've also been trying to find ways to get better at the game and see if there is anything I can change about my play style (I've definitely seen some improvement since I first started playing though I'm still learning), but I still get extremely mad at these small things and it's been a wreck on my mind, even in winning games.

TL;DR I tilt over things that really don't matter that much, and that impacts all of my games. Because of that, it's been a challenge for me to get better at the game and I'm afraid this kind of behavior is gonna affect my ability to play the game with my friends, as I really don't want to be a problematic player. Is there anything I can do to try to de-stress or calm down during a game and not get as tilted, even when it isn't necessary to?