Yes, of course it's a serious problem. I'm just suggesting that the OP (or any other learner) could strive to take a different attitude towards their learning materials. In fact, I would say it's essential to do so in order to learn anything.
I don't really know how to do that, even though I did so myself with regards to both math and history. The most I can say, is you have to just dive in and involve yourself deeply enough in learning that you don't have time to think about whether or not you're bored, and having done so, take the time to realistically recognize and congratulate yourself on your accomplishments. If you can feel the satisfaction of making more and more progress, it's much easier to dive in again next time until you no longer remember how you could have been bored by such an engaging activity.