Who has access to your secrets?
Not hackers to Apple ID database, certainly. IF it were possible. they would certainly not mess around with publishing photos
Someone with physical access to your phone and knows your password(s)
You could change your email address to one that only YOU know about - AND - create a VERY strong password = then keep those credentials safe from EVERYONE
Change your Apple ID - Apple Support
Change your Apple ID password - Apple Support
Two-step verification for Apple ID - Apple Support
What to do after you change your Apple ID email address or password - Apple Support