Sometimes it just doesn't work, no matter what. Sometimes you're just meant to be big. I am a former wrestling local city champion, currently a kickboxer, and also practicing jujitsu. I move fast and sprint like I'm 140 pounds, I can roundhouse kick someone that's 5'9 in the head, and I'm almost at a split. I can do 50 pushups, 12 pullups, once ran 8 miles, and have done high intensity cardio 5 days a week for 2 hours everyday. Yet I'm 250 pounds and a huge gut.
My diet? Eggs, veggies, rice, fruits. No sugar at all, and yet I have not been able to lose weight for the past 2 - 3 years. I have slowly watched the scale climb up no matter how many calories I cut or how many carbs I don't eat. Sometimes you just can't fight your body and you're meant to be who you are.