When time stands still

What would you do when all you want is to scream out loud to your friends and say get a life, that's a mean thought isn't it?

I was out with my buddies a few days back. Went to a local night club and was having a good time when suddenly i wanted to move away .. away from the crowd and my friends. When i looked around i felt so out of place, wondering if i Even know anybody here.. ironic when i was just enjoying myself a minute back.
I am not having a mid life crisis am not even that old to have one.. but it still feels that happiness is so elusive..it feels like the people you have been hanging out with the past year don't even know you.It lasted maybe 5 minutes but was so real. I couldn't enjoy myself after it. I left the club almost immediately, only to let me come back the next morning as i reflect on it.The experience has left me maybe slightly disturbed
If you could experience such a standstill when you have been on top of the world,It makes me wonder what is the real ingredient for happiness and how do we measure it ?