Dear Sougat Ji,
As per vastu main door should be larger than all other doors, Here are some directional tips for entrance door:
If entrance is in north, doors must be placed in left half not in right half which is north-west. If entrance is in south, do not place door in center of house. You should place door in right half.
In east facing entrance, door should be placed in right half and in west facing entrance left half is the best option.
Still I would suggest you to consult a vastu expert of your own area for best remedies etc.