I Feel Like Riot Is Against me

I just can't take it anymore. This is just me venting out my anger. Managed to climb to Platinum 1 playing my favourite role. Always faced some trolls, afks and the likes from time to time. But ever since I hit Platinum 1, I felt like Riot is against me. Going on 14-game losing streaks, more trolls and afks and all the good players were in the enemy team. I even happened to have same people in my teams for 3 games straight, and they did bad in all 3 games. Surely, I do mistakes, I never said I was perfect, but I'm REALLY frustrated. Now I'm in Platinum 5, nearly 0 LP. I've tried everything to untilt, but whenever I feel optimistic, BOOM! "F you and your optimism mate, you're demoting". Just wanted to get this out of my chest..