I can identify with this. When I was younger, I would sometimes get a little obsessed with certain girls but not really know how to talk to or relate to them. It became something of an obsession and I would creep them out. The problem was that my obsessive behaviour caused them not to even like me or want to have anything to do with me. I could have had a nice friendship at least but I ended up not even having that. That's why you need to be careful not to behave in a way towards this guy that will make him uncomfortable. You also need to be careful since this guy is way older than you (although you don't say how much older). That adds another complication. You wouldn't want him to get into trouble.