Dude, DO NOT fill the Propecia script. That is some bad stuff. When I found this forum, I had been googling info about Propecia. I read some of the horror stories here and other places. If you think that you're self conscious now, wait until you have man-boobs from Propecia. Or how about a limp willie?
Your hair is fine. Don't let a doctor, who does want to sell you something, make you believe that you're in desperation mode. And don't kid yourself about that "free" appointment. Why do you think they do that?? It's because they are also good salesmen and they are trying to sell you their service/product. You should hear the pitch that plastic surgeons give, during their "free" evaluation.
Don't get suckered in. Enjoy your hair. You have a lot of it. When it does become clearly evident that you are losing it, rest easy knowing that you can shave your head and look better than you ever imagined.
Lastly, read through some of the stories on this site. You will see one theme over and over again. Almost all of us wish that we had shaved sooner and learned how great it is to be bald. I am one of them. Shaving my head was incredibly liberating and it gave me a huge boost in confidence.
Relax and enjoy your life. You have nothing to worry about with your hair.