Hard Stuck in high silver/ stuck with inters 30% of my games

Over this 4 day weekend I managed to get to my gold 5 promos for the first time :D, I lost my promos under the pressure really stuffed me up. Since I have had 6 games 3 wins 3 loses in those three loses 2 of those games I have had inters or people that don't know how to play their champ I don't have any idea of what I am meant to do to finally get out of this shit whole of a rank, it seems impossible. if anyone would like to help or has advice please share im sick of people ruining my games and not being able to get out of silver.
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