when does breastfeeding get easier?

Abbie
It still hurts from poor latch! Baby girl is 3 weeks old. I have to help her latch and it can only be in the cross cradle position. I need my boppy. When I'm nursing I have to stay very still or else she will slip down and it's excruciating. Iv tried other positions but she can never latch correctly! I don't even know how to go about feeding her in public.