I used to have this too. Not Bag, but other words. You can practice saying the word like this: Breathe in, briefly hold your breath Begin breathing out, as soon as air starts flowing, try starting the word “bag”. When i do “bag” like this, it sounds like “hhhhhbhhag”. Try this method, and gradually use less air before starting your first “b”. Eventually you’ll be able to immediately say “bag”, with a soft B.