Hello there. Sorry to hear you're struggling at the moment. Just wanted to say that what you're describing (afternoon/evening constant feeding) is pretty normal (nick-named 'cluster feeding').
Your DD is, as you say, fresh out of the womb and it is pretty normal for her to want to feed/suck - it's academic whether its for nutrition or comfort, and it's probably a combination of the both. But having been fed in utero 24/7 it takes a bit of time for babies to establish any sort of routine, and when you're breastfeeding it's not a bad idea of feed 'on demand' in first couple of months to help establish a good supply of milk. By the third month you'll producing lots of milk, your DD will have more strength and expertise at sucking (and will feed more effectively - clearing your breasts more quickly, so feeds will reduce in time from 40mns or so, to 10mns or thereabouts - it's not an exact science).
It takes a huge leap of faith to believe that what your breasts are producing is going to feed your child, but it does work (we wouldn't be here otherwise!). Your breasts will be sore intially, and you could look on www.kellymom.com for more info about how to care for them at this stage. But please take heart, things will get better.
Try not to worry much about other things - housework, getting 'back to normal' (that's completely different now anyway), or whether you should be adhering to someone else's routine. Try to be guided by the baby - if she's rooting and you can offer a breast, then do so.
The early days, weeks and months of breastfeeding are terribly difficult and tiring, but it does get easier and in the long run it can be very rewarding for you both - not least for the health benefits, the convenience and the economy, but also for the amazing bond and closeness you will experience (once you've gotten over the soreness and are feeling more confident about BFing).