Hello...im White Male, 42.5 Years Old, And Always Tired...not Sleepy,

hello...im white male, 42.5 years old, and always tired...not sleepy, but sluggish. The thought of exercise pains me. Speaking of pain, my joints ache all the time when I walk, Yes I am out of shape. 6'3 270lbs.
I know I need to lose weight, but I believe there is more to it. Please advise.