Stopping tilt

Hi, I dont mean to be one of those pest like people who are here to go omg im losing etc why I get bad people bla bla.

But there cuts a fine line. Out of my last 20 games ive lost about 16 of them. Every time I try to better myself and be even better the next time I play. Unfortunately it is beyond a joke when about 4/16 of those losses were 4v5 and the rest pure 12 year old like people who would flame eachother to the point of no return despite being the one who made the mistakes. I always find myself winning my lane and trying to help out as many of the other lanes as possible at all times. There comes to a point where im 18-2 as a hyper carry and still manage to lose games. At the same time the majority of my games end before team fights even happen. It is beyond a joke how many people I get in my games that seem to be so bad on my team but so good on the other. My usual game consists of top and mid feeding to no return making it impossible for me to do anything in a team fight despite winning my lane hard.

Is there anything I can do? Because believe me I know when I make a mistake or didnt do something right. I would actually say that only about 10% of my losses come from me not playing as well.

So yeah what do I do because no matter how much I change up or change my mindset or help people it always ends up into a loss before 20 minutes even pass.