Stop playing League due to trolls

Hello, Mostly I have been playing normal games, because I found them less stressful than the ranked games. Now I started to play ranked to be aware of my position in the rank ladder. I am silver IV now. But what I found, in these ranked games there are more trolls/feeders than in normal games. My main role is ADC and half of my supports are trolls, who doesn't buy support items, doesn't use wards, leave me alone on lane, then cry why I am not able to defend the turret, or just sleeping and doesn't engage when the enemy adc is alone, but he/she goes when the enemy support is back. Of course trolls appear in other lanes as well. So approximately I think 80% of my ranked games encountered with trolls. My aim is with the game is to be better, having fun. But these trolls make it very uncomfortable, and makes me angry, when I take a match (especially a promo) very serious, while my teammates are AFKing, feeding, spamming in chat that they will report everyone. I tried other game modes such as 3v3, but that is too random. I can play with level 10 players who know nothing about game, in enemy team there can be diamond players. After these I am asking you, that aren't you experience these???