Visitor Visa - B2

i am goverment teacher with 15 years complete, my sallery is 60,000 Rs., i applied for b1/b2 visa,
my husband and children has all ready b1/b2 visa,
my first interview as bellow

interpreter : good morning
me: good morning,

int: passport please
me: i handover passport

int: where you going to usa
me: dysney worl, florida

int: why you want to going
me: my children want to visit dysney worl bz them friend visited,

int: your children has us visa
me: yes, my husband and children has us B1/B2 VISA

int: you visit other city
me: yes, first visit new jercy, their my husband business meeting for 2 days with them business distributor, than after we going to Florida,

int: your husband business partner name
me: i provide name and address

int: what you do
me: i am government teacher

int. whats your sallery
me: 55,0000

int : what your husband work
me: my husband has factory --------

int: your children visited USA before
me: no

int: which standard your children study
me: 8th, 3nd and 1st

int : your husband visited other country
me: yes many country, USA, CHINA ( i not informing more country name like : italy, germany, russia, south korea and many more) only short answer

then after counselor break interview and going out for 10 minute and return,

int: which hotel you stay,
me: i provide hotel name and booking detail

int : your visted other country before
me: no

int: are you not pefect and return me passport with 212 FORM,

they taking total 20 minute and reject me,

i not understand where i am wrong,

i think my children and me not visited other country before, or i apply for B1/B2, I THINK I APPLY ONLY FOR PLEASURE

please guide me so i re apply visa