>I have tried to be active, but could not fit it into my mentality. Note that I did not say my lifestyle, I said my mentality. I am unable to be active. I was not an active person a a kid, and I am not one as an adult.
This is a very important point. What we do in youth affects how naturally we can do certain activities.
The only thing I'd suggest is not artificially limiting what "active" is. For instance, some people think it means jogging and lots of sweat.
Whereas my exercise is mostly periodic walks, looking at things and thinking, and then barbell exercise. The barbells are a significant mental puzzle as you work on the form and try to recruit muscles to apply more force to a bar moving in an efficient path off the ground.
My dad enjoys golf, which is mostly walking, and plotting how to get a ball to another point.
Some people enjoy bouldering, which mostly involves strategic thinking in terms of how to move across a course on a wall.
And there's many more things that care "active". Others in their replies have emphasized that your later years will involve premature cognitive and health decline, long before you die, if you're sedentary. And they're correct.
But telling you that alone won't change anything. So what I'm adding is to consider that their might be some activity that will help keep your body and mind in shape AND that you enjoy. Finding one might involve talking with a good athletic therapist, or just googling – but I expect there is something.