This used to be the basis of the mathematical curriculum in schools for long-time. Fortunately this changed, because its format is *not* for educational purposes. Unfortunately, the only way aspiring mathematicians can get to know this work is to study it independently.
There are several renditions of this work on the web (on which is works very well, because you can design interactive diagrams that illustrate the concepts admirably) but there's nothing like holding the real thing in your hands.
This classic translation is more footnote and commentary than body (you don't actually see anything by Euclid himself until half way in), but that's probably the way it should be. Heath gathered up everything that had been written about Euclid's work, extracted the juice and presented it as the definitive Euclid experience. Yes, his style's clothy and arguably over-academic, but then this translation is a century old. Maybe it needs updating and made more street, nah-mean innit, nome sane? but don't let that put you off.
Geometry *can* be a tricky subject to get your head round, but don't let all the horror stories of your ancestors' sufferings in schools throughout the centuries make you think that geometry in itself is torture. You never know, you may discover some geometric theorems of your very own. I did.
Oh yes, and there's another two volumes of this - but these first two books, comprising this first volume, are undoubtedly the greatest books of mathematics ever written.