Mate I have 700 Wins and I still suck, don't worry
https://www.facebook.com/LoLSaintvicious
https://www.facebook.com/WILDTURTLEX
https://www.facebook.com/snoopeh
these are some streamers I watch
Also, try watching League of Legends Champion Series, you learn more from all of them but of course, you learn mostly from yourself and your own mistakes (this list can be expanded)