This is true, but being an awkward, socially inept, desperate for approval soul almost certainly makes you more prone to being led into drug use in the beginning, no? Particularly when you live in a place like LA, where your image and social acceptance means everything.
It's a slippery slope. Insecure, socially inept person with awesome genetics and a good work ethic reaches a height of social admiration in the drug-heavy, cut-throat social culture of LA. But they just can't shake that nagging voice inside their head that says, "you're a loser, why would anyone like you?" And so, when cool, hip people offer you drugs, you take them to fit in. Or something along those lines at least. And then you start hanging out with those people, partially because they are "cool," partially because they let you hang out with them, and partially because you have begun to get addicted to drugs. And yet, when you make a comment, you never feel fully comfortable. You see people side eye each other and smirk. You're in the crowd, but you're at the bottom of it, because everyone sees past the muscles to the insecure, socially awkward, obsequious soul inside. And then you compound the stress of being accepted into, but near the bottom of, a social hierarchy in a materialistic city with the stress of your entire career requiring the approval of others and that causes emotional problems and problems in decision making (mammals low on the social dominance hierarchy show greater HPA axis activity. Long term heightened HPA axis activity results in structural damage to the prefrontal cortex and hippocampus and amygdala, which are the brain regions most heavily involved in decision making/cognition and emotionality). You combine this damage to the brain regions implicated in decision making/cognition and emotionality with drug use and latent schizophrenia, or at least the predisposition towards it, and you get a disaster.
So, no, being a socially awkward teenage is not a sentence to being a cum-guzzling Youtube monkey, but being a socially awkward cringequeen and then having your entire career surround getting social approval combined with some latent mental illness stuff is not a good combination.
And, just generally, when you can tell someone in their early 20s is "off" for whatever reason it usually is a decent warning sign.