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Help!!!

Hi everyone! I am 19 and four and a half months ago I got back from a ten week trip. I've noticed over the past 5 months that I have been gaining a lot of weight. Before we left I weighed 76Kgs and was 177cms tall. I now weigh 97Kgs and my weight is still going up. My BMI is 31 and my body fat percentage is 31%. I'm now considered Obease.
I really need help but cant be bothered doing anything about it.