it's definitly you , thinking teammates are bad won't make you better , if you lack of skills , just play champions that doesn't require skills (Nasus , Garen , Rammus , Xin and so on) and start to use brain and when you fail don't say omg my ally sux didnt help me , watch again the reply and see where did you fail and why you died , with just game knowledge and using brain you can get to gold easy i'd say , you of course have to know all champions and especially your champion that you are playing what he can/can't do and when .