Might have unintentionally lied on Background Check, any tips?

I had no clue how much job history to put down so I put down just about all of it (~8-9 years worth). There's a diner I worked at in high school and I thought I worked there for a year but I only have a W2 from 2011 so I guess I didn't work there in 2010 as I thought I did. I provided the 2011 W2 but will I get in trouble if the employment dates are not what I honestly thought they were? The place is out of business now which makes it difficult.

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