the first few months are very tiring. my daughter used to wake up every hour for feeds! she would refuse to take a whole bottle at a time no matter how much i burped her etc.
there is no set age that they stop waking up. my daughter didn't until she was a year old and my son slept through from newborn til 8 months then started waking up again!
it's all the joys of being a mother. do you have a partner who could help share the burden? or ask family or friends to mind her for a few hours during the day so you can have a little sleep. you need all the help you can get so don't be afraid to ask.
good luck and i hope she sleeps through for you soon