你说不好可能自己加罪

http://www.criminaldefenselawyer.com/resources/criminal-defense/crime-penalties/texas-minor-possession-alcohol-charges-penalties

Minor possessing alcohol:  Class C misdemeanor, up to $500 fine and community service.

If you said what you said, it is possible you confessed to Furnishing Alcohol to a minor.  

Furnishing Alcohol to a minor: Class A misdemeanor, up to one year in jail.

Pick your poinson carefully.