I`m a puss*

[Eve]

I believe that people often feel the need to do something when the wisest choice is to do, and say, nothing. It is sometimes the hardest choice. Trust me: although you were tired, or felt under the weather, you made the right choice.

Doing nothing can be an intelligent strategy, and gives you an upper hand.

[Triny511]

Start working out. It will boost your self confidence and courage.
Also, a better solution to situations like yours is to learn how to deal with things in the politest possible ways, even when dealing with idiots.

I would agree with this. Though it sounds demanding, what is healthy for your physical being is probably helpful mentally as well.

[Tyler The Creator™]

Thats not being a pussy you were simply being the bigger person.