This just pisses me off

Today I decided to play JG but got autofilled top. When we went on the loading screen i saw that everyone was on 100 and i couldnt load in and decided to alt f4 and then reconnect. My jg was just camping mid even though he was winning and i had to deal with a Garen that was 4 levels above me. I told my jg like 100 times to come top and he was staying mid. I was literally pissed off. After the game ended i decided to look at everyone's profile. My bot was 2/11 and they both were bronze our mid was s1 and our jg was unranked. Meanwhile their team had a Graves which was Plat2 their adc was s1, their mid lane was G3 and the other 2 were unranked. Can someone explain why do this happen? I'm trying to have fun playing this game but i can't since im playing with bronze players while their team has gold & plat players