Disclaimer: I'm not a qualified coach but am training (albeit via Inclusive Skating, so not Skate Excellence)
Everything you're struggling with, are things where your weight needs to transfer from two feet to one side or the other. I'm not familiar with the levels but I think this is quite a common issue for people as the first things you learn are how to balance on two feet, so please don't worry. Everyone is different, and particularly if you're an adult learning alongside younger skaters, it can feel especially frustrating.
We don't all learn the same way, and that's what I find frustrating about group lessons - they cater to the majority, anyone massively ahead or behind can sometimes feel left out and get frustrated. Good coaches can make it work, but if the group is large, it's not easy. How big is your group, and do you have any assistant coaches on the ice? How do you prefer learning in other situations? Are you someone who can learn by watching, do you need a verbal explanation or do you just need to give it a go?
Off ice, stand with your feet slightly apart, like you would in your skates. Practice shifting your weight from one foot to the other, and then back to the centre. Also, it's a cliche but bend those knees, and keep your core muscles engaged. Hopefully this will help you get the feeling, and then it'll translate onto the ice.