Why is it so hard to climb ranks?

Everytime they always Ruined my Promo and I used to be silver V then got demoted to bronze 3. I'm literally Fuked and got no Team Clans and I really need someone to help me. This game is starting to be So stressful just like flappy bird. Ugh why Riot. Why did u demoted me? I worked so hard and I prey God to put me to average rank. If I can't Go silver then I'll move to Clash Of Clans Because I'm Ranked Master in that game. Leagueoflegend is the hardest game ever!! K so hopefully no one is judging. I may suck at leagueoflegends but I'm so pro At Clash Of Clan.