In need of some inspiration and/or motivation

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Hello my name is Ashley I am 22 years old and newer to the mfp forum and mfp in general. I'm looking to lose about eighty pounds. In a years time my husband and I are going to the Bahamas for our honeymoon we didn't get one when we got married. I currently am 6 feet tall and 252 pounds far from where I want to be it seems. I'm looking for motivation I've been trying to lose weight for two months now with no success I keep going back to my old behavior. Any advice on changing or keeping the healthy lifestyle? Obesity runs in my family and when my husband and I do have children I want to be healthy.