Frannie, what this sounds like to me is your reactive mind realizing just how open you were to being hurt when you talked to this guy in the way that you did and it's trying to find a way to not have it happen again. From the way that you described yourself, it sounds like this is a part of your very shy personality. For that moment, your true personality won out over the shyness and allowed you the ability to say something of a personal nature to another person. To keep you from doing that in the future, your mind is making you feel like in this bad way.

Let me tell you that you definately do not have anything to regret about what you did on that day. Those actions showed that you aren't as shy all the time as you think and that you do have the internal strength to overide that shyness when you need to. The fact that you had the strength to go up to this person and tell him that you thought that he is attractive is a great sign and something that you should definately be proud of.

We all have a reactive mind that makes us question things that it thinks might cause hurt or pain, be it physical or emotional. While it can cause a lot of problems when combined with things like extreme shyness, it is also a definate positive step when you are able to overcome it to do something that could put you in danger. Don't feel bad or any regret for talking to this person in the way that you did. Be proud that you did it and try to do it again in the future.