If the internet decides to condemn you for saying stupid things when you were a kid, then the Internet is at fault, not you. Social media promote cancel culture like crazy (which I abhor), but I doubt the allegations (if they ever take flesh) will be taken seriously considering the fact you weren't a responsible adult when you said those things, but a child.
It angers and vexes me to see that cancel culture has taken a hold of the internet so much to the point that children are scared of being harassed by cyber-bullies.
Remember that anything you say on the internet is equal to saying it on live TV, and act accordingly.
But people should refrain from saying racist things not because of cancel culture fear, but because it's not right to be racist.
Anyways, take care, and don't worry about it - only famous people are at risk of cancel culture.