Hello everyone!

I have started a new job 3 weeks ago. I thought it was a great opportunity to live on a new country and lean new things. To be honest, i love the country and its people, but the problem isn't that I'm not sure if I took a good decision accepting this job.
When the company approached me 4 months ago, everything sounded like a great opportunity. I have been offered other jobs, but I turned them down as I thought that this one would be the right one for me.
I had to wait for them for 3 months and when they finally sent me the final offer it was not what I expected. They said they'd offered me housing which is one of the unit they sell and that I could eat at the cafeteria for free too, but that the could only offer me a very low salary, as the real job would just be available in two months from now. I accept it, as I have already turned down the other offers. The apartment is really nice, but what they told me would be training it is just pure work. My boss just asked me to do things and to organize the work with the rest of them team. I had to do market research, aniline our competitor, and I have the full office schedule from 9 am to 6 pm, sometimes more.
Yesterday they paid my first salary and I was kind of frustrated. Even one day we had to travel for an event and I worked the entire day until 11 pm.
I don't know but I have a feeling they're exploiting me. What can I do? I have received zero training so far.