Do you guys feel frustrated for not understanding something?

So there is this sum I have been trying to understand. I asked my teachers and friends, but none of them could explain it to me properly or tell me what I’m doing wrong. It’s making me irritated, and I feel like just leaving that specific sum. If I get a similar sum, I’ll just write the exact same points without thinking too much. But then, on the other hand, I feel guilty, like what am I even doing in life? Do I even have the capability to think?