What adjectives are appropriate to describe this feeling?

I would like to ask you what adjectives can describe this situation and the emotions that the person might feel in the below situation.

Below is a situation.
You have missed a subway train by almost a couple of seconds of time.
If you walked a tiny bit faster from the entrance of the subway station, then you definitely would be on board.
There is no big problem, you just feel some kind of emotion when this kind of things happens.

What adjective can be used to describe the situation and the person's emotion?

I am not native English speaker, and however hard I try to come up with an adjective, I cannot think of any.

Thank you very much for the teaching.