Emma Chamberlain is the quintessential cool girl and, honestly, somewhat of a paradox. With more than 9.5 million YouTube subscribers; 10.5 million Instagram followers; her own podcast, merchandise, and coffee company, Chamberlain has every reason to exude an ego. But nope, the wildly successful 19-year-old has managed to stay humble and approachable. It makes sense. Unlike many curated influencers, Chamberlain is unfiltered and…