Weekend Post- My Issues

As a normal teen I have many issues. They seem like it's the end of the world when they arise but I always have someone to pull me back to reality when I start to over react. The issue of this month or even week is my grades. I feel like i did the best i could on my final exams but I also feel like its not good enough, like I was capable of doing much better. For example, in my english class i studied for an exam that didnt even have most of the information i studied on it. I was pissed and even then i still did not do well on the test. In U.S. History no matter how hard i study i still get in the 80s percential- i hate 80s because i feel like if your going to score high you might as well go for the 90s. Why me???