Underactive Thyroid And Swimming I Exercise A Ton, And Still Can't Lose Any Weight...?

I exercise a ton, and still can't lose any weight...? - underactive thyroid and swimming

I walk, jog or bike every day .. or even a combination of both .. and swimming when her beau. and still can not lose chub in my stomach ...
I am a gourmet, and I love fruits and vegetables .. I've received, chocolate and fries, the fast food from scratch. Do not drink and pop ... so whats up? Why can not lose that stubborn fat on my waist and stomach.
I think I have hypothyroidism and I was soon controlled. is what is my problem?
or could it be my birth control? Fluid retention?
I am so frustrated by this ..