求翻译：今天我很不开心，因为我的功课又不会做了，我觉得真的很难。每当人家那么容易就能解答出来，我都会觉得自己很失败，为什么会这样呢，我并不觉得自己比别人差，我也相信我一定能够成功的。所以，只要我肯努力，难题就不再是难题。是什么意思？

Today, I am not happy, because my work is not done, I think it was really hard. Whenever people so easy to answer, I feel fail, why would this be, I don't feel worse than the others, I also believe that I will certainly be successful. Therefore, as long as I work hard, the challenge is no longer a problem.