You sound like a pessimistic girl.

If you look up the dictionary, it says Pessimistic is an adjective, means tending to see the worst aspect of things or believe that the worst will happen.

It is more an attitude towards your own life.

Only if you start changing sleeping habit, appetite, etc for a certain period of time, at this stage I don't think you have any clinical signs of depression (from your description).

Don't worry mate, and be happy.