Like you, I was pretty okay with my size until I couldn't walk down the stairs in my house without holding all my weight on the rails with my arms because my knees and ankles hurt so bad. Speaking of, it took me over two years to heal a sprained ankle back then, and it still gives me problems. I like being able to move and do stuff now. Technically, I'm probably still fat, as my BMI is right at the borderline between overweight and obese. But I look and feel pretty good. I could be lighter, and I will, because I want to have a stronger, more functional body. I can do more now, and I love it.