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

A couple of years back myself and a couple of friends were enjoying some late night weekend drinking. As usual, the bar was packed and I was still waiting for drinks after 40 minutes or so. I am not a patient person. I saw many people come and go from the bar yet I was still to be served. When I finally secured a place at the bar, about to hail the bar steward, only to notice a sharp, digging pain in my left side. I look, a young girl, around 18 yo was stood there, I heard her friend tell her to 'dig her elbows deeper'. Then she somehow managed to get in front of me to the bar, block my path and allow her pal access. I had waited too long for this to happen and not yet being drunk I quickly thought of a plan. 

"It's OK ladies, allow me. This rounds on me. What would you like?"

They requested their order, though I never bothered to listen to it. They then freed up some space for me to get to the bar. I ordered my drink and nothing more. I then proceeded to explain to the barman how I had heard these girls talking about school and probably weren't old enough for drinking. I turned around to see them casting me some really evil looks as I left the bar with only my drink. They lost their place, had to wait some more time only to be refused drinks as they failed to produce ID.
<bot>: Girl elbows me out of the way in a bar queue, I offer to buy drinks and instead buy only my own, alert the bartender to possible under-age drinking. Feel like a boss all night.