Try and put religious arguments aside (while this will have some overtones) for a moment and work with me here and not throw the notion of time having no beginning or end which is equally frustrating to comprehend.
Reverse the creation story and you wind up at the beginning with light and darkness. Before light there was darkness or nothing.
But what was before the "darkness" or nothingness? The religious will say God whom has no beginning or no end, but how did God or energy pop into to existence if there was nothing?
Then, put yourself in God or energy's place... You are in a "space" with nothing around you... everything is void... Then where did "you" come from?
I know this is linear thought and time and the universe should not be considered in this way many in the field of science and mathematics explain... I understand the many dimensions that are possible and how time should be viewed, but it still doesn't answer the question of how something, anything came of nothing...