I used to smoke weed and party and stuff like that"
Well, yeah . I'd be very wary of a young girl who had a reputation like that hanging with my son.
Wonder how she found out about all this . . .
You are going to have to show her that you have changed. And that takes time and it takes demonstrating IN PERSON what kind of person your are.
So you see, you are going to have to spend time with her.
Either face it or hide. That's your choices.