What do you do when your Parents and Friends are driving you crazy?

I'm a college student right now, and as much as college is suppose to be fun there's times when we must work. I'm stressing over that fact that I have two midterms on one day, and one of the midterms is on a Thursday night, the night of a Lakers game, which I bought tickets for. I wish I could go, but now I can't. My parents especially my mother, happens to keep saying stuff like I'm so worried about you. I can't focus now because it feels like my own mother is doubting my capabilities. Also, she acts as if I don't know what I'm doing. All she ever says is "Oh ask for help if you don't know that." I KNOW ALREADY!!! STOP REMINDING ME. Then she tells me I should stop being so upset. How can I not be upset? I have friends who day by day tell me stories of their life living in apartments, and how much fun they have. I don't live in apartments, instead I live in the dorms with freshmens. It's not fair, because I could have been living in the apartments, just like my friends, having that much fun as them. I couldn't because two my suppose roommates backed out on me, thus I ended with two people instead of four. Then I have this one friend, who use to be very close to me, has started to become less of a friend. Instead she's been spending time with her suitemates, who dislike me. I think that her suitemates have poisoned her minds, to start treating me like a villain. At this point of my life, I don't know what to do. My mother is driving me crazy as well as my friend.