"you cannot create matter all that is here has always been here in some form or another."
"you cannot create energy or matter or anything.
you may only change its various forms."

What you mean, of course, is that the sum of energy+matter remains constant.

In the 19th century matter and energy were thought of as two entirely different concepts. For almost a century, now, it's been known that such a distinction was erroneous, and by the end of 20th century, not only had matter been converted to energy, but energy had been converted to matter. It wouldn't surprise me to find that a great many kids leave school without knowing this, such is the sad state of science education in some parts of the world.

Here's one of many reports on the conversion of energy to matter:

http://www.skybooksusa.com/time-travel/physics/matter.htm
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"Time is what prevents everything from happening at once" - John Wheeler