The other night I walked into this bar alone, got a drink and sat down. Moments later these two girls who were sat on the other side of the bar came up and asked if there was anyone sat next to me. There were loads of other free seats around and they knew I'd only just walked in on my own. Then the one kept messing with her drink and hair, fidgeting about and then they both sat there really quietly. I know they were interested in me but I couldn't bring myself to meet their eye contact let alone talk to them.

What can I do to approach girls when they are clearly interested?