Columns in word

I'm having trouble dividing my text into two columns. I use the latest version of the Office for Mac and whenever I select my text (which is formated with bullets, headings, etc) in order to make it into two columns, the Word divides it in a different way. Is as if my text was divided into paragraphs, and within those paragraphs there are two columns. All I wanted was to divide the whole text into two columns, maintaining a linear structure (starting from the upper left side, one paragraph after the other until the page ends, and then the text can continue in the upper right side of the paper). That doesn't happen, the text starts in the upper left side, but when it's the middle of the first paragraph, it gets divided in another column, continuing from the upper right side. Can anyone help me with this problem?

Thanks in advance!