What is your husbandry like?
Enclosure size, temperture, type of hides (are they tight?) etc
How big is your snake, how often do you handle it etc.
In 99% of the cases of young animal not eating (500 grams or less) husbandry issues are to blame.
You do not assist or force feed a snake that knows are to eat you unless everything else has failed and the animal health is in jeopardy, this will include live feeding.