Please Help, Very Short And Quick, Really Need Answers?

Firstly, I’m a girl. I play acoustic guitar at a youth group. This week was my first time. I was putting my guitar away, and out of the corner of my eye I could see this guy kept glancing over at me. He looked about 20. I started talking to someone else, and he instantly walked over and joined our conversation. He asked me heaps of questions. Then I got delayed talking to someone else. He waited around for me to finish my conversation with the other person and jokingly said “You can’t go yet, we need to finish our conversation”. Then he asked for my Facebook. When I said I didn’t have one, he asked for my number. Then he rang my phone so I’d have his. He was really keen to talk to me.
Do you think he is interested or just being friendly because I’m a newcomer? I’ve been told I’m very pretty, but I don’t know…I’m just so shy so I doubt he would be interested.