Sam being angry, come on, never !!

of late, I'm being very rude to people at work - I'm not sure why? Yesterday was one of those days, where I told my Manager that it was practically impossible to complete a piece of work which we were supposed to deliver. He immediately said,"Sam, we surely need to complete that...". "It is surely not possible for me to complete", I responded again.
Then started the real argument, where in he said, "can't you complete the work or are you not able to complete the work (In other words, don't you have the ability to complete the work..)"
What would my response be? He is my Manager!
I said,"Think whatever you want, I won't complete it." - not a good example to anybody, isn't it? :)

Some of my friends were aware of this, one of them was in the call with me, when I responded that way and obviously the word spread to some of my other friends.
... Some of us had a discussion about this & I was justifying my position & my friends were saying why I shouldn't have responded the way I did...


After I came home, I started realising that I was being angry & rude for not so good reason. I could have explained to him politely as to why I wouldn't be able to complete the work.
My manager & I were in a call the previous day, to sort out an issue involving other teams, besides that I was handling few other work which involved interacting with other teams, coding simultaneously, preparing for other calls, team meetings & so on, besides one of the key resources was on leave. I could have explained all this to him, but instead first responded to him in a very rude way & then out of anger made all the above points. What a mess I had created :P !!

May be too much work is taking a toll on me!!

My good Lord, have mercy on me :D , make me a good boy!!