My advice for you would be to not get rid of "unhealthy foods" completely , I found that small progress is much better and gives long term results vs big progress that you cannot maintain for long anyway.
Start first by including one healthy meal a day (or at the frequency that you choose) , this meal must contain veggies / fruits and some kind of meat.
Swim or walk just once a week.
If you can do that for 2 weeks straight , add a session / meal.
This will get you going
(you can keep eating bad foods
)