Training 2 hours a day 6 days a week is absolutely on the high end of things, so odds are your training can definitely be improved. I'd suggest a focus on training smarter, not just "less". What does your current training plan look like? The days, exercises, sets, and reps, and the cardio too.
Also, what does your current diet look like? You said your BMR is 1700 calories, but what are you actually eating?
Lastly, what's your specific goal? "Lose weight" is vague and doesn't give you a solid target to shoot for. Are there numbers you want to hit? A goal physique? Something that will give an idea of when you're "there"? Check this article for more info:
Then simplify everything. Forget about how many calories you burn or BMR. Maybe even forget about trying to "lose weight" and, instead, focus on having three quality meals everyday that give you enough protein, carbs, and healthy fats that allow you to train hard and recover sufficiently. Things don't have to be complicated to be effective.
I agree with the others, that it makes no sense even paying attention to the supposed "fact" that you burn whatever % of fat and whatever % of carbs. I can promise you that nobody who got into awesome shape took a breath test and based their approach on those results.
x2 on this advice. There's nothing at all wrong with just checking in with a professional and saying "Can we talk for a minute?" They're not going to give you fitness advice (hopefully), but they should help you re-align your perspective and understand that there's honestly no reason to be having dark thoughts because you're having trouble losing fat. But it's an unfortunately common situation lately.
You said you were in shape before, so it's not like some unachievable goal.