When creating your profile on social networks, you need to avoid being tied to the “physical” world as much as possible.
You cannot indicate your address, date of birth, school, class. It is better to use an obvious pseudonym: it should be clear from it that this is not a real name (after all, using false data: “Alexey” instead of “Alexander” is prohibited by the rules of social networks).
There is no need to put your photo on an avatar if you are not at least 15-16 years old. All children and adolescents under this age, posting their photo, run the risk of becoming a victim of an intruder.