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It sounds like your account may still have an old parental consent/Family Safety relationship associated with it, even though you are no longer showing correctly in your father's current Family group.
First, sign in with your own account at account.microsoft.com/family. If you see “Leave family group” next to your account, use that option.
If you cannot leave, check the date of birth on your Microsoft account and make sure Microsoft recognizes the account as an adult.
There is another important possibility: parental consent may originally have been granted using a different Microsoft account. Microsoft states that only the adult account that originally granted consent can manage/remove that consent. This could explain why your father appears as the administrator but neither of the accounts you checked shows you as a family member.
If your account no longer appears in any Family group but Windows still shows your father or applies Family Safety restrictions, Microsoft recommends refreshing the Family Safety configuration on the affected PC. Open Command Prompt and run:
schtasks /run /tn "Microsoft\Windows\Shell\FamilySafetyRefreshTask"
Then restart the computer.
If the relationship still appears after that, I would contact Microsoft Support because this may be an account-side Family Safety/parental-consent relationship rather than a setting on the PC.
I would not create a new Microsoft account — your existing account should be recoverable from this state.