Baby feeding

My baby is 13 days old and I’ve been breastfeeding her which means that I’m up and feeding her each time at night and all during the day. My fiancé and I are trying to see if she’ll eat from a bottle as well (still breastmilk) and she ate from it earlier but it doesn’t seem to soothe her the same way, especially at night. Does anyone have any tips? I’m so exhausted. Also, to those of you who fed their children strictly from the breast, how did you do it? How did you survive?