I agree with Blanca it didn't sound too bad a night.
You approached by yourself all night with no wingman to back you up that takes balls.

You should have asked the first girl if he was her boyfriend, you didn't know for sure. You held both of them in conversation and made them laugh, you pretended to pull something out the girls hair and she smiled, she could have got pissed off and the possible boyfriend could have got pissed too but because you had put them both at ease this didn't happen.

Try to get out of your head and not think 'what are they thinking about me' because they'll most likely be thinking the same.
There are some guys in London you could go out with that might help.