Emotional Rollercoaster

For some stupid reason, I'm upset. There really isn't any sort of major reasoning behind it, it's just that things aren't necesarily going my way and so I'm mad about it. Examples:

1. Signing up for group work. I accidentally signed up for a different group, and so I'm working with some people I'm not too familiar with. I am SO MAD about it. I can't even comprehend it.
2. Taking a class because I would know people and so I wouldn't have problems finding a partner. WRONG. I ended up having to reach out to random people because the professor asked us to find partners right away. It drives me crazy.
3. Making a fool of myself in front of the lab professor. I should be more active and much more devoted. Instead, I'm not looking too sharp.
4. Being nervous about presentations. I wish I wasn't rushing and being such a wuss.

GAHHH. I'm just so tired of all of this. I want the hormones to go away and just to be a much more balanced me.