I'm very confused on what my future is with League

2 years ago when I started playing this game I was loving every moment of it, even though I wasn't experienced at the game I still enjoyed getting that adrenaline rush and that's what got me pumped and got me playing more. A year later I started turning into this toxic mess, that adrenaline that gave me happiness just wasn't the same. Yes I still kept playing, but I have exhausted myself and soaked in all my time into playing this game just to try to get that same feeling again.

I don't know why I am so toxic, I have no clue if it is me or the game itself, and who I play with. My attitude going into every game from champ select is normal, but then I get into laning phase and It becomes a completely different ball game from there. What am I creating out of this and why do I get so frustrated with every bad outcome?

I need some positive feedback and advice from players who have improved from this behavior or just know better, because I don't wanna resort to this toxic environment every game I play, and it is super hard not to. College is starting soon so I don't know if I should just find limitations or just quit the game for good, because I don't wanna keep playing this game if I'm going to keep getting perm'd for toxic behavior, I wanna fix it and feedback/advice is key.

Thanks