My area of expertise...
To be brutally honest, you aren't getting into the lounge. You used to be able to sweet talk the dragons but as of ~2 years ago, policy change made it impossible to enter unaccompanied if you are under 18. Your chances, even with all the tactics mentioned above, are zero. EK is extremely stringent on this.
Regarding the UM lounge, some dragons offer this as an alternative and try to sell it up as a good option. Don't take it. You'll be happier at Shake Shack!
It's just one of those things that's better when you're 18
. Don't get your hopes up and you won't be disappointed. Enjoy J!