I admire your determination, but might I offer some unsolicited advice?
I think running is bad for everybody. It's hard as hell on the joints, and isn't very good for weight loss. A better solution is to train with weights and do low intensity cardio, for no more than 30 minutes a day. Low-intensity cardo burns fat, rather than carbs, and does not burn muscle as things like HIIT and other carb-burning activities do.
Doing HIIT is faddish, and it does burn carb calories, but I find it takes away strength gains and makes me irritable.
Note. I'm 63, and I've been through about every type of training there is. I am paying the price for doing things stupidly in my younger years. Old men love to offer advice. Don't be your parents, as the saying goes.