There are sooooooooo many ways to do macro.
The way you are trying is a cost nothing exersize that can work ok .Also remember you can stop the lens down for some desperately needed focus depth -do this on the camera with the DOF button while removing the lens,it will stay stopped down ready to use.
you can get a reverse adapter to make things much more stable and acurate.I guess you'd pay about $40(?) for a reverse adapter-it may even come with the right step up rings to fit both lenses
(or you can make one out of a camera body cap and filter rings glued together....)
You can buy the VERY expensive lens reverser that has full electronic connections (several 100$??!).Good for fast work as you can then focus with full aperture
You can buy an extension tube kit that holds you lens the right way round but furtyer away from the camera so it can focus closer.these are convenient because all elcetronic connections are still there
you can buy various add on diopters(effectively magnifying lenses) for the front of you current lens
Figure on about $20 for a super cheap one to about $50+ for a kit of several,up to about $160 for a genuine canon one.The midrange ones are adequate in quality
By the way...diopters are very good in one way..they don't lose any light compared to other methods so the shutter speeds will be higher.Wether that's relevant to you is your choice.
you can attach any old manual focus lens to you camera with an adapter(or hold it there by hand).This is the same idea as using the standard canon lens but may actually be easier because you can manually set the aperture.You can use 'em frontwards or backwards and any extension away from the camera will increase magnification.
Oddly with ANY reversed lens,the wider the lens the closer the focus(and so higher the magnification)
There is a limit though.I seem to remember that anything under 28mm allows such close focus that your practically touching the object you're focusing .So 50mm lenses are the most popular for this job.Alot of people make home made variable extension tubes that hold a 50mm lens
(i think this is the only one left!?)
True macro lenses
These are of course the most conveniant and highest quality.Wether you need that quality is another thing....
I find macro done with mid quality kit is still very good because it's such a dominant subject that most people will never notice the sides of the pic are slightly softer or whatever
Then again you might want a proper macro lens because you can use it for a portrait lens also or such strategy