<human>: Give me the gist of the text in a nutshell

So I live with my mum and nan (long story) and today I'm going out with friends but wanted to get ready quite early so that I could spend more time in town shopping. 

However I have become addicted, like many others, to reading posts on the let's not meet sub, and I spent about 3 hours on there *facepalm*

Back to my story. We have an electric shower and I tell my nan I'm going in there so not to use the water downstairs as it makes the shower go too hot or too cold. Half way through my shower, I have my body lathered in luxury soap and a hair mask nourishing my hair. Suddenly the shower stops and starts beeping. Great. 

"Nan! Nan!" I call out but to no avail. I try again and again but no reply. I guess the electric has gone and my nan might be out the back garden and can't hear me calling. It's usually quick to solve, just put the electric key in and it'll work. I sneak downstairs, dripping wet with soap covering my modesty as I try not to be seen out the windows by the neighbours. 

As I get to the kitchen I see a note from my nan saying "Gone to the shop to get electric, won't be long." It has now been 30 minutes and I still need to wash the soap off and finish washing my hair. I'm just sat on the shower floor feeling defeated.
<bot>: So TIFU by not getting ready when I was supposed too (when we probably would have had enough electricity for me to finish my shower) because I was on LNM. Mehhhhhh.