is an economics major something you're supposed to double major with?

I have also been interested in majoring in economics but i wanted to know if its something you’re supposed to double major with or can i just major in econ?

Yes. You can do either.

If you intend to go on to PhD study in economics, you may want to take substantial additional advanced math and statistics courses, although a double major is not strictly necessary.

In general, these days the most employable econ majors also have serious coursework in applied math, stat, and (preferably) some CS. But there’s no rule or anything–plenty of people major in just Econ.