2nd 50lbs so much harder to loose than the 1st 50?

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In retrospect it seems like my first 50 slid off like butter cut with a hot knife. As my 35th birthday approaches (Oct 19th) I'm realizing there is no possible way of me hitting my goal by then. Disheartening. Downer. Bummmmmmmmer. Any one else struggling with this 2nd half thing?