I seem to have some problems in ranked games

Hello everyone, a month ago i stopped playing normals and started with ranked games, it seemed like i was winning almost every game, so I got to silver 1 after some wins, after that I started playing against golds and such... and I started losing like every game, it started to annoy me kinda why I keep losing, and sometimes although we have a good team coordination, I still lose, I admit it that its sometimes my fault, but I keep watching streams to learn from them, and i still keep losing, I keep trying and keep saying "okay calm down, the next game will be better" but actually it's not helping becuz everytime I lose, and i dunnu if it's all my fault only or my team's as well.. so I will be really grateful if any high elo players give me some advise about this, and what should i do. Please help me with this and don't start calling me names :$:$ Thanks alot :)