Well, okay, but the very first thing you see on the SU home page is “The easiest way to draw in 3D,” which is simply not what you’re doing. Friend’s recommendation or not, that’s sort of a red flag, isn’t it? I’m not trying to give you a hard time, but we live in an era in which there is a tremendous proliferation of software types and capabilities, and the ability to objectively evaluate software products against a specific set of criteria and select the best match has become an essential survival skill. Choosing the wrong software in the professional world can put you at a tremendous disadvantage from which you may have a tough time recovering.
That said, this question (what’s a good 2D drawing application) comes up fairly regularly, so you may take some solace there. See this earlier thread:
Creating a key for a 2d floor plan - SketchUp - SketchUp Community
-Gully