Help ☹

My daughter is 3 weeks old and she has been fed expressed milk for all that tkme3of her little life. I am exhausted having to pump for her and feed her and just have to do eveeything. I'm trying to train her to grab the boob, but she won't have any of it. I've managed to get her on the boobs with a nipple shield, and she'll latch on after a few minutes of crying. When I latch her on, she'll feed for about 10 minutes and then that's it, she's done. How do I get her off the bottle until I have to go back to work? Also, is 10 minutes on one boob enough tome for her to be satisfied? FTM, so thanks for any advice!