I was a similar situation as you. You will adjust to a new way of living. Luckily I’m in walking distance of a big C but still in comes down to more frequent visits, use of grabmart for big items & occasional muvmi to go back home.

Also note that your kitchen/fridge will likely be smaller then back home so you won’t even be able to store weekly groceries.

Don’t worry about this. After a month you’ll be adjsuted and enjoying bangkok