New FP problems and how to stop myself at the outset.  I am undiagnosed and am not on meds or in therapy.

I met a woman yesterday in my friend group.  Small gatherings are starting up again, and she was there.  And she was beautiful.  And she was smart, and had opinions, and ambitions, and a sense of humor, and in my head I have already married her.  She is perfect.  And we're a lot alike.  Like, A LOT.  Like, so much so that I know this isn't real.

I had seen her twice before sometime last year, and while we didn't even talk, her face resonated with me.

I am already completely obsessed.  And we're all desperate for attention, and I felt like maybe she was interested in me, too... but I told myself that there's no way she would ever even consider me as a friend, let alone romantic partner.

I am already infatuated, and we may be at another gathering together next weekend, and we're both likely to get too drunk again and I want a one night stand with her and I also don't want a one night stand with her because I want to be madly in love with her and have her be madly in love with me.  I want to lay next to her and rub her temples and hold her close to my chest.  I want to risk my health and well-being just for a chance to kiss her once.

I've never been able to stop myself and I'm really scared right now that I will ruin everything like I always do.  What can I do to stop this now, one day later, before it gets worse?  Please help.