God did not create Himself, because He was never created. He has no beginning, because for there to be a time when He didn't exist, there must be a timeflow for Him. Since He created time, however, He cannot be bound by time.
(Note: a decent grasp of geometry will help greatly with the rest of this post.)
Think about it this way: if space and time are the same thing scientifically, and God is omnipresent (in all places at the same time), then He is also, in limited human language, in all times at the same time.
Imagine, for a moment, that our world is only a two-dimensional plane, and that time is the third dimension.
this is time.
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\/
^
| - moar future
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| - 2020
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| - lol2012
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_|_ <- this is us
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| - 1999 (Pepsi girl commercials)
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| - 1996 (Fresh Prince gets cancelled)
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| - 1989 (I'm born)
\/
The plane that represents our world is constantly moving through time, but only taking up a single point in time at a... time. If we were 3D, however, we could take up multiple points along the time axis, just as we can take up multiple points in height and width. That, compressed into graspable terms, is God. God extends infinitely across all axes. Asking who created God is exactly the same as asking where a line ends.
<-------------->
When we draw it with those arrows and say that it "goes on forever," it really doesn't do justice to the infinity of the line. Those are just analogies based on the way we draw and on the properties of limited line segments. In reality, that line doesn't just "go on forever," because there's no "going" involved -- it already exists at every point on that axis. It doesn't have a starting point because that's just not the way it works.
Similarly, saying that God is "eternal" or "never-ending" doesn't do full justice to His nature, and are just analogies based on mortal lifespans. God isn't never-ending simply because He lives a really long time, He is never-ending because beginnings and endings are simply non-sequitors when it comes to Him.
I know this is probably hard to grasp, but think of how difficult it would for a line segment to understand a sphere. Because the line segment can only see what's on the plane, he can only see the infinitely thin portion of the sphere that intersects with the plane at any one time - namely, different sized circles or a single point. However, even though all the line segment can see and fathom is two-dimensional shapes, the sphere is still three dimensions.
In a similar way, God may make Himself known to us by intersecting with our plane at various points in time, but that doesn't mean He is bound by time the way we are, restricted to a single point in time.
(BTW, thanks for the reciprocal compliment.)
