Regardless of whether or not others feel that you were embarrassing yourself, I completely disagree with this statement:

"I believe your true person is who you are when you're happily drunk."

When you're drunk, you lack insight, you make foolish decisions, you lack co-ordination, you can blackout ....

Sorry but none of those are my "true" state.

Your bf said:

"You were drunk, stumbling, annoying your cousins and I don't like seeing you like that."

Your response was:

"Fine. Is that all I did?"

I think you have an utter lack of awareness, responsibility and accountability for your actions.