I went out today with 2 friends and I am writing this before I go to bed after we've been out at a club. So I am the braver one out of the group and I approached a couple of girls tonight. I was able to hold on to conversation with 2 couples(two sets of two girls). After a while they lost interest and decided to go into the club(We were outside of the club when I approached them). Even though I was able to open them up and they were friendly at first, they lost interest after a while. What could I be doing wrong? Or what should I do to keep interest?