Indeed, his behaviour also strikes me as odd and You sir might very well be right on the money.
Yeah, obviously everything in his post is LIES. He doesn't live with his Polish grandparents, he doesn't have a Polish uncle, and he's never been to Canada. Obviously he's trying to redocument himself because he's half Persian (what does PERSIAN mean?)
Eurasian: I would suggest that you ignore the sorts of people who are immediately frothing at the mouth with suspicion because you mention Persian heritage. I'm not that much older than you, but I made a decision not stay in Poland (although I never lived there I spend months there) and return to New Zealand to be an adult and get a masters and pursue my career. The choice I made is going well for me, but I think about what might have been as well. I really did want to learn Polish, I really did want to get all around central europe, I really did want to experience Polish culture from the core. I have no Poland-specific practical advice for you, but it sounds like you have a firm base in Poland already: if you're living with your grandparents, 1500zl per month should be enough for you to have plenty of fun? No doubt you will be able to fit in Polish language study without changing your job, but if you do want to be a bar tender in the first instance you should just apply for jobs and see if you get them. Marginally useful bar courses are offered the world over.
If you want to fall in love and be a family man and have kids, then go back to Canada and study something and start on the 8-6 treadmill. If you just want to be a young guy enjoying his life, stay in Poland a bit longer!