T_T

I don't know why I get to cry so easily. At first, I got upset because my housemate did not wait for me for dinner. I end up eating fruits at home. Fine, I don't mind. I can forget about that. Later, when my cousin say he wanna shift out from his house where he is now staying with his mother and brother, I burst into tears. I don't know why. I am not sure if this is call stress. I am having four tests on this coming fri, sat and mon. I haven't finish revising any of them. When I look at my notes, I don't understand a single thing. I don't understand even reading them. I feel like giving up on my studies, giving up on my life. My result has been getting worst time to time. Sometimes, I ask myself, "Why am I so stupid?", "Why people can get good result but I can't?", Why am I keep failing subjects while others are improving?". And, I can't find answer for these questions. I have been studying hard, did pay attention in class but still I fail. What is happening to me? Did not do well in studies, not physically attractive, basically I don't see myself good at anything. I do cry for being so useless and I know crying doesn't help but still I can't control. I cry over small matters. I know this is not a good habit. Can anyone please tell me how to be someone stronger? I hate being weak but I have no idea how to grow stronger.