HELP! What am I doing wrong?

I’m pumping 30 min and getting half an Oz or nothing at all. It hurts and I can still feel my breast has milk! I’m getting sick of these things and I want to give up! I did it with the flanges and without. It’s only worked once.

Should I wear a tight bra with them?
A loose one?
Can I freaking walk around like I thought I was suppose to or with this move them?
Does it hurt to pump?
Does this still stimulate my breast or am I wasting my time waking up every three hours to pump!?

Sometimes when I am pumping for a few minutes and realize that I’m not getting any milk I adjust the pump and watch it until I see that it is working correctly. My bra gets in the way sometimes or I don’t have it positioned just right. Don’t know if this helps or not but that’s normally the problem if I am not getting milk