I am over weight cant loss it what ever i try?

i have a question about weight loss i have been fat all my life i cant stand the gym or sports i am active go fishing all the time i go hunting so i am all ways in the woods i am a huge gear head and love working on cars so i am working on cars all the time and it what i do for a living to i am a single dad of 2 little children so play in the park with my kids i am never siting on my can and yes i eat right not a lot of junk but i am 350 lbs my blood perisher is high my tried are high and my blood sugar is going up that never happened before don't know why i have a friend all he is a store manger after work ever day is go to Katy's Lemonade stand byes a 64 oz lemonade and 2 sandwich if squeeze it you can see the 10w40 drain from it and then go's home and kills a 12 pack in two hours plays the xbox all night and his weight is 150 lbs sopping wet what am i doing wrong