Some people confuse Genetics with Destiny.
You may be pre-disposed to be an alcoholic. Doesn’t mean you are born one, just mean that when it comes to alcohol, you could become a habitual drunk faster and easier than the average man on the street. People seem to understand this.
Then there are genes that make one pre-disposed to be obese. Doesn’t mean you will be; just means that you may not get the thrill from exercise that others get. Some people run and feel fantastic; others run and feel wasted, exhausted and are essentially done for the day. No thrill, no “rush”, no endorphins - just tired. Remove the positive rewards and no matter what shape you are in, you won’t want to continue to do the exercise, will you?
I have had to work to stay reasonably fit, my entire life. I get no thrill from a hike, a bike trip, a run. I can run 3 miles and NEVER feel the endorphin rush - ever. I feel tired, I’m done. I do it because I feel I need to; not because I want to. Never get any enjoyment out of it - it’s a chore, but it keeps me from weighing 500lbs.
My grandparents were heavy, my mother has been fighting her weight since she was a child; and so have I. I have never been a track star. Even at 5’11” with a 6-pack and weighing 168 at 32; exercise was a chore. At 52 it’s still a chore.
I have the propensity to be very obese, all I would have to do to be morbidly obese is continue to eat 1500-1800 calories a day and stop exercising. It shouldn’t be that way - but I assure you it is. If I got the “rush” others got from exercise, it sure would be easier to get up and hit the treadmill or the gym every morning.
Have you tried listening to music when you workout? What a drag to not get the high. Have you tried running outside? What sort of food do you enjoy. Do you know your blood type? If so you may want to read up on Eat right for your Type. They list everything from style of exercise that is fitting to food. I thought it bunk intially but have found a lot of it true about me. That is fantastic that you keep at it. Enjoyment or no enjoyment that is what it takes. Kudos to you!!