It's nice to chat with a group of people, but it's hard to find a topic at 1V 1 (-).

There are several reasons: 1, 1V 1 are of the opposite sex, and the people who make you feel excited just like each other, not very well. So you're nervous. I don't know what to say. Always hesitating, worrying that he/she is not interested in the topic he/she is talking about, or that it is impolite to talk too much. Solution: The key is that you should learn to overcome nervousness. Speak out what you want to say. You are not afraid to make jokes and lose face in front of everyone. What are you afraid of in front of him/her? He/she wants to see the real you, not the fake you.

2. In front of everyone, others bring up the topic. You analyze the response, and you know where everyone likes it. At 1V 1, the other person may be a boring person and have no topic. So you don't know what he likes. And boring.

I don't know if the analysis is correct. Because I don't know much about your specific situation, it is for reference only.