Reckless behavior and flirtatious mannerisms, how should I talk to my girlfriend about it?

Anonymous
So my girlfriend is a flirt, but has stopped since we have started dating. However, the mannerisms, I guess you could call them, seem to be there. I was getting ready to take her home one night from an event and I saw her and her friend run off. They came back and said they had to smell the men showering since they smelled good, then talked about how good one of them smelled. I have relationship anxiety, and need reassuring. So that made me feel a little inadequate even though there was no real reason to be. So, while this probably her just being nice, helping her friend enjoy herself since she doesn't have a boyfriend, it bothered me still.

Another thing that bothered me was that the other day, she told me she was going to see her brother in a couple of weeks and said she was going to see if he would get her drunk. Her logic was that she'd rather know what it felt like now rather than later. I'm sure she knows she'll feel horrible and the next morning, so I don't understand. She's never had alcohol before. I have no problems with drinking, but for her do willingly be reckless about it, and do so with her first taste hurt me. I drink on rare and certain celebratory occasions, but I have no intentions of purposely getting drunk if I can help it. She was reckless like this with guys in high school, and I think, that this may be some form of release for her since she's dating now. She also mentioned almost trying weed before. I'm against drugs of that nature. I know that there are many health benefits to smoking it, but it seems the only reason it should be used is for medical reasons. If you don't need it, then why even mess with it? I understand the same could be said about alcohol. I'm afraid to say anything, because it's her decision to do these things. I'm not the boss of her. I just don't want to say the wrong thing. I feel dumb for being like this over something so small, but if I don't say something now, then it may keep happening, and I'll just feel worse.
Updates
+1 y
In the beginning, where I said, have started dating, it should be "had." We've been dating for four months.
Reckless behavior and flirtatious mannerisms, how should I talk to my girlfriend about it?
1 Opinion