One thing I've noticed, as I've gotten older, is that it's getting harder and harder to learn new things. It's as if there's this part of me that's starting to refuse that I need to know new things. I liken it to my brain being this established snooty neighbourhood, and any new knowledge is seen as a bunch of lotto-winning hillbillies moving and upsetting the status-quo.
Whenever learning anything new, there's this uncomfortable feeling I get all over. It's directly proportional to the difficulty of the material I'm absorbing. It get's worse with age. I hate it. But I totally love it.
Normally we avoid things that make us uncomfortable, but if we're not careful, we miss out on things at our peril. Think of the first time you went for a run, or hit the gym to get into shape. It was pretty uncomfortable right? But if you stuck it out (and you did, didn't you?), it was all worth it in the end.
Now, whenever I'm learning something new, be it a Code School course, or something longer form, like a Coursera course, and those hillbillies move in and start causing a ruckus and make me want to give up, instead of shooing them from the neighbourhood, I welcome them in, bake them some fresh brownies, and learn that they weren't so bad after all.
Never stop learning, even when you don't feel like it.