it is shocking to me that you are 23 and have never got drunk? If you want to socialize and meet new people, you need to have a drink or two - especially at your age.
Please note: This is a misleading advise.
You slipped. It is your fault also. If you are so nice, then why were you a part of this sick atmosphere?
You yourself have written that the Indian and Chinese left and was not a part of this really crazy party. So you did get tempted didnt you? ... and you have paid for it.
See... such parties happen in Poland. Such people are found everywhere, who come easy and go easy... So there is no use thinking or tearing your hair after them.
I have no advise for you. You will probably do whatever suits you.
P.S. Polish women are not like that. All kinds of people here...many of my friends (me including) wait for the right girl, and avoid alcohol at any cost! I AM A POLISH.