I think the internet is catching up to people where now almost everyone across the entire internet has some sort of embarrassing backlog of posts they've made as a kid. If you want to be untraceable then I guess make a new identity. If you've ever posted your real life information on your account however, good luck lmao.
Either way, what you've posted online is never that big of a deal as long as you are capable of handling humiliation. Unless you're a criminal. Or it leads to some kid you killed in CSGO locating where you live and stabbing you in the neck as revenge.