I want more milk in my ?

i started off bottle feeding and then went into feeding her but stopped because i was having sore , and now i want to feed her fulltime even if its painfull coz i think nursing her soothes her, but when my baby sucks on it, its like shes not getting enough.shes is 19days old. she prefers milk then formulas n wont drink much just 1 n 1/2 ounce every 2 hours.