I don't have a child in my family sharing. I am the sole owner with other emails on my account

How do I keep hackers from getting into my apple id

Apple provides a high level of security for Apple ID. You can protect your account by following the suggestions in

Security and your Apple ID - Apple Support

The key points in this document are:

• A strong password
• Keep your password private
• Don't share your Apple ID
• Use Two-factor authentication
• Keep your information up to date

A further document Apple ID security overview provides similar information.