If we lived on Mars one problem would be the trouble of breathing. There is only carbon dioxide on Mars, which is dangerous for humans. We would have to wear stinky space suits all the time if we wanted to survive on Mars. Your suit wouldn’t smell very nice if you needed to go to the toilet!
Another problem would be food because there are not many things to eat on Mars that taste
that satisfying. I don't think there is any food up there at all besides rocks to eat. I would need a life time supply of food from earth to feed everyone properly.
Some people would hate it there. All of gasses that come over from jupiter Mars hot . People would die if they got too close to Jupiter. All the pressure would crush them like a hand squishing play dough!