TikTok private content

Hi guys so I’ve never ever really posted anything publicly on any social media and I’ve only recently started publicly posting that doesn’t have my face and privately posting on TikTok (silly videos of myself doing rankings) and they are set to only I can see but I’m wondering if there was any way the people that own TikTok can post this without my permission including instagram snapchat etc? Wondering if I should just make all my accounts private or delete them all and be totally anonymous if possible on all social media just to be totally safe or just delete for good. Just would like outside opinions thankyou for replying if you do <3