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I went on my first solo long distance trip in May 2008. I drove from Denver, CO (all the way) to the border of Kansas and I found out that was absolutely nothing there
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I'd probably say "in May of 2008," or "in May, 2008."

In formal style, I think "Colorado" should be written out.

comma after "Kansas"

In your version, you need both the existential "there" and the demonstrative "there."
"and I found out that there was absolutely nothing there."

You could say, "and I found absolutely nothing there."
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I went on my first solo long distance trip in May 2008. I drove from Denver, CO (all the way) to the border of Kansas and I found out that there was was absolutely nothing there.
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 Avangi's reply was promoted to an answer.
Of course there's a difference between saying, "I found absolutely nothing there," and saying,"I found that there was absolutely nothing there."
In the first version, you're making a statement about what you found. (You're not a very good looker.)
In the second version, you're making a statement about what is. (I found the truth to be X.)
- OR alternatively, In my opinion, the truth is X.