@pell First, start fixing your mindset around exercise. “I hate it!” Is always going to make it more difficult for you to do it. Instead think of the benefits it gives you, and the “good feeling” of success you get after doing a workout, even if it’s just a walk. It’ll help you look forward to doing it.
You’re very heavy which is why it still sucks so much, and you likely have no muscle which makes it harder to do anything. (I remember when I started doing 10 squats a day at 160lbs and they were HARD because I had no muscle)
I would jump on your treadmill and start doing a steady pace on a
steep incline to start building up your glutes and leg muscles. You don’t have to do it for long.
Then start adding some simple bodyweight exercises after like simple squats (make sure you are doing them right) and maybe some upper body workouts. Ease into it slowly and don’t overdo anything. It’ll be harder to workout the next day if you’re extremely sore.
But the main thing again is reframing your mindset around exercise. It’s SO good for you and your health. It sucks only because you suck AT it, and like anything in life, the only way to get better is to just do it. Eventually you’ll learn to look forward to it