I am only young, 20 years old.
At that age, you're not going to find any work. Teaching is flat out, as is just about anything else. The only possible option you have is a really, really lousy job in a call center, and that's not going to pay the bills. Nor is any call center going to go through the hassle of applying for a work permit for a lowly flunky. Sorry, but you're dreaming, and Poland does not treat dreamers kindly.
By the way, I live in Wrocław. It's a great city to live in if you have cash, but can be depressing as hell if you don't. Don't expect long-term hospitality from your partner's parents. They might put you up for a week, perhaps, maybe even two at the outside, but after that you will be expected to contribute your fair share of the bills. Otherwise, they will unceremoniously give you the old boot in the behind. It's always open season on moochers in Poland.
Your best option is to stay in your respective countries and pursue your education. At your age, you can little afford to waste time bumming off in Poland. You'll see in a few years that the ease of learning you now take for granted begins to dissipate, so do all you can to learn now while your brain is young. And give up silly dreams of long-distance love with someone on the other side of the planet until you have some real salable qualifications and experience under your belt.