Unless you are at the extremes of the skill system (low bronze or GM) you are equally likely to be the worst as the best player in any given match.
If you are better than the average player at you rank, you will win more than 50% of your games, and will climb over many games played.
See How Competitive Skill Rating Works (Season 14) for more details, especially the summary.
P.S. Most of the people who have posted in this thread are conspiracy theorists. Believing them will hold you back.