Insanity and Robert Bruce

Insanity is when you keep doing the exact same thing expecting a different result.
Yup, tick that box - I do that!
Robert Bruce said: If at first you don't succeed, try and try again.
Yup, tick that box as I also do that.

So dear fable and moral writers which should I do....because they don't work together it seems!
Example - today I thought to get myself out of a bad mood, I would take 30 minutes to mail a package to my Mum and brother.
Love gets to me and I realize I do not have anything for my brothers wife, Michelle. So I stop and buy her a few little care package things. Nice right?

Get to post office - no computers working its cash only.
Drive back down the road to an ATM.
Drive back up the road to the post office.
45 minutes later and 8 people behind me screaming "Get Out!!" - the post office have convinced me that my Mums town does not exist. Even though I have shipped there before, NO, it does not exist. I have it incorrect, when I know I don't! Package is brought back home and bad mood continues.

So, am I wrong to try and try again to break my bad mood? I have plenty of examples to show of this type of activity. Paint my home office a really nice color. The second gallon I purchase is exactly the same as the first one apart from the shade. Re paint again!
Make a nice meal - Moroccan Salmon - answer work phone to try and assist someone, salmon burns and could have been steak!

So is trying and trying again simply being insane? Help me !!!

Oh well...therapy tomorrow, that's always good for a laugh.