It's possible for someone to consistently beat the market just like it's possible for someone out of many to flip a coin heads 20 times in a row.
Everyone who says that they in particular can beat the market consistently year after year, unsurprisingly won't reveal any evidence behind their claim. It's always things like: "Oh, it can be done. Trust me! There are ways! You just don't know them and we market-beaters do! You just have to analyze harder, bro."
Trading for regular people isn't supposed to be some thrill seeking sport. Millions of dollars are spent on wall street to get "an edge". You really think you can do better ?
This is the mentality that needs to be checked. All those people trade huge money they don't care about some tiny trader moving $100k per trade. So yes you can do better as you have less capital to invest.
That makes no sense ? They're not actively trying to crush individuals, they just have more resources to access information before you.
The more interesting questions is "can you actually, consistently, make money if you are good and spend a lot of time analyzing the market. In other words "can you actually have an edge on the market". From what I've seen it's so but most people don't believe it.