I agree with the Romans 8 guy even though you thought it might be boring to go to a youth group. In fact, it takes more effort to hang out with a Christian youth group or a campus ministry. In that case, they will likely hold you accountable to living as a Christian.
I don't recommend going to night clubs and having a drink or two because this is probably a gradual pathway away from the church (as another member noted). If you're bored, to be honest with you, so much of life is kind of boring anyway. Alcohol does not solve this problem. Nor does it solve any other problem such as having difficulty making friends. I would seek out a new interest (as someone noted above). It could be canoeing, hiking, playing cards, or you can start your own club. Maybe it's people who go to the movies every Saturday night or something like that. I also recommend Celebrate Recovery. It's a Christ centered fellowship for any hurt, habit, or hang up. If you can find a meeting near you (I'm not sure if they're in Poland), perhaps you can go there and tell them that you're bored, thinking about picking up a drink, and that you presently have difficulty making friends. It's a honest program.
And by the way, the devil likes to make people think they're missing out on something. You mentioned you missed out on the university life. He told Eve she was missing out on that fruit over there. Some will tell you a drink or two doesn't hurt but based on what you're saying, it just doesn't sound good to me. There are so many other avenues you can take. If I could go back to my younger years, I would spend much more time learning about God's Word and becoming the person that God wants me to become and the person God created me to be.
