5 losses in a row in placements

Ok now that ranked started i was hyped to climb back to plat and even higher. That was soon crushed when I lost 5 games in a row. I don't know what to do. I tried so hard and I lost somehow in every single game. The first 2 games i was the jg and I did all I could to help my lanes get kills and put pressure but either my team still died or they just weren't following through. Then are my other 2 games where one my adc dc'ed halfway in and the other where I admit was my fault. I fed my lane and didn't apply pressure at all. I don't know if this is all bad luck or if ranked just got that much more difficult. Even as i type this, I am extremely angry and I am so tempted to play my other 5 games to just get it over with. What should I do?