Can i know how to focus myself when carrying out the Deep Focus habit, if my daily schedule is packed and my surroundings are disturbing

Practice, your focus habit.

Also, learn to set your boundaries with others by practicing a prepared phrase to tell colleagues when you do not wish to be disturbed.

Little by little. Start with creating your working space- very small, perhaps, but yours and dedicated to work. Put a timer for 10 minutes at first, if 25 seem to be too much!