Feeding newborn

I am at my wit's end. My baby is 2 weeks only but during the day time she sleeps too long and needs to be dramatically aroused to wake up to feed and at night she wakes and fusses every 1-2 hours. I am not sure if she is drinking my breast milk fully so I ended up giving her formula. And after that too, she woke up after 30mins?! What am I doing wrong?