So couple weeks ago i meet this girl, she seems really interested. Also told me I look like a better version of her first bf. She then asks my age, i'm 19 she 21 or so, 'age is not a problem she says'.
So then she says she wants to go to a party in the weekend, my response is that if she's nice i'll drive.
Great, i think it's fixed cause she only knows one other guy at that party, so i'll probably be able to make some moves.

Driving there a casual conversation, seems to be comfortable in talking to me.
When we arrive it turns out she knows alot of people and I don't see her that much.
So I don't really get much chances to escalate.
Carride home again a casual conversation in wich i try to tease her a little bit.
She ends with her plans for next weekend so we can meet again.

Weekend after that i go out with my friends, got a bit drunk. Didn't know she was going to be there but she shows up, i approach her talk a bit, saying it was too bad that i didn't see her much last weekend "would've wanted to get to know you better" But then she says you never had a chance. "What do you mean?"
"You're too young" Being drunk i was shocked and didn't know what to answer and the conversation stopped.
My friend said it was just a shittest.

But what do i do now?
And what do i do in the future when a simular situation happens?