Check your attitude with younger colleagues. Just because you're old enough to be their Mum/Dad doesn't mean you're going to be any better than them at the subject. You're all starting from the same point of knowledge. Talking to some of them later in the course, they were intimidated by my apparent confidence. I had to explain that I was as terrified as they had been, but my working life had just taught me that looking confident can help me get through difficult situations. Maybe being a bit more open with them to begin with, would have made my integration a little faster.
I found that initially the younger cohort were wary of me, imagining that I'd be judgemental and disapproving (I was 44 when I started). It took me the first year to convince them I was OK and I was just one of the bunch from the start of the second year. It was a slow start but they were all good people and so much more sorted than I'd been at their age. They're dealing with a much more complex world than I knew, and start out their adult life with the type of debts and money worries that I didn't encounter until my mid twenties. Remember that much respect is due to them.
I agee with the poster above about rewarding yourself. If you're used to a full-time job, just taking a couple of hours off to go for a walk mid-afternoon, can feel like the most ridiculous treat. Or having an occasional lie-in on a weekday when you don't have a lecture to get to. Think about how those things wouldn't be possible if you were at work - it really increases your enjoyment!
Another weird thing, is getting used to your own working patterns. Just because your previous job insisted that you worked 9-5, doesn't mean that those are your most productive hours. I never usually got going on independent things like reading lists, coursework and revision, until early afternoon. I used to beat myself up about being "lazy" until I realised (most of the way through my second year) that I was then routinely working through until 9-10pm quite comfortably - I was putting in the hours and I was consistently getting 2:1/Firsts. Find what works for you and relax about it. You are your own boss now.