when does it get better???

Does it ever get better??? I have a four month old that still wakes up every 2-3 hrs to eat.. every night it's a struggle to put her down for the night. She dnt sleep during the day she's awake all day.. most of the days she's fussy just wants to be held... idk y people say it gets better cuz I feel like it's never gna get better I'm so exhausted all the time and beyond sleepy... it's like I have a newborn... I feel lik I'm failing I c other moms on here saying there babies sleep all night and ain't fussy and happy babies and I feel lik my baby girl is not happy.. I get so depressed sometimes cuz I feel lik it's never gna get better I love her so much and I'm so thankful that god has blessed me wit a daughter (I have two boys and always wanted a daughter) sorry just needed to vent... thanks ladies!!!