It IS normal on the principle that everybody's different. I felt "my milk come in" only in the sense that I got hot & cold shakes, etc during those 2 days - sort of an all-over hormonal thing. Never felt letdown, though when my lo was a bit older than yours I started being able to feel the difference between when she was really sucking a lot of milk (sort of a gushy feeling right thru the tip plus a pulling feeling deep in the breast) or not. What you can feel has no relation to your supply.
Probably as you resolve the soreness, though, you will be able to feel more sensations - that pain kindof blocks everything else out.