How to lose 55lbs in 7 Months

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Let me preface by saying, I never thought I would be motivated enough to actually lose the weight. I always told myself I would try, but I really had to beat myself up to get the damn motor running. At my worst, I weighed 205.6lbs. For reference, I'm 5' 6", so weighing 205.6 would put my BMI at 33.2, which is clinically obese. As I write this, I weigh 150.2, and I've never felt better in my entire life. How the hell did I lose 55.4lbs?