Bronze Duo Smurf Partner!

Ok, I've been stuck in bronze. I know that it is possible to get out of bronze as bronze is as easy as it gets but I still lose. I have solo carried games but than I lose and lose; I don't blame anyone but myself. I know I'm bad, I keep reminding myself that. However, I want to get out of bronze; I'm sure that I can have a decent win ratio in higher bronze or silver as I've proved it to myself time and time again. Anyone willing to help me? Thanks in advance!