Wholeheartedly agree with OP.

The way I see it, doing is the single most important force we have, and you're almost never too young to start doing what you are passionate about.

You can also say, at a younger age you will have more free time to do; far more time to tinker and have fun doing things (AND learning) that you may not otherwise explore when you're older since you simply do not have the time.
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The fact is that people don't make decisions. We have a base program from our genes, and then we process the determinist input from the world around us. Fun is totally relative. You are taught by input that some things are fun. If you had different input different things would be fun. Thus you can have a fucking blast your whole life doing nothing but being alone with computer shit, and you can have fun "having fun" aka chasing girls, using substances, doing various activities. If we have learned one thing from countless memoirs, journals, blogs, and biographies is that EVERYONE has regrets. Having a different lifestyle has no effect on regrets. Regrets are a function of missing things. And because all the possible activities in the world exceed our capacity, even with an infinite lifetime because every action we take creates new possibility we cannot avoid missing things. Now we can only regret what we can imagine. We are given a message about what we should be doing and if we aren't doing that we regret things. However the number of messages we get as well as our ability to enforce our actions on others, ie you regret not dating some girl but of course you can't make her date you you can only try to influence her to, limits our ability. For instance I have received both messages that the ideal life is a long term loving relationship with a nice nurturing girl, and that I want to bang as many hot girls as possible. I cannot both bang all possible hot girls and have a long term monogamous relationship with a "nice" girl. Therefore even with only 2 options I will have regrets. I also get messages about being a gamer, a punk, a skater, and a slacker, and at best I can taste each life only a little. Because of that I will always have regrets and so will you. I want to make a movie, a game, a play, do poetry, write a book on and on and on. I can't do it all. I will always wonder what if. So will you. If you are honest with yourself.

I think most of you are missing the point swiftcoder was trying to make. Of course he didn't say "stop learning to program and just be a normal person." It's all about living a well balanced life. You don't have to chase a redhead, you don't have to learn to fix motorcycles, you don't have to learn a new sport. People, that was a small sample of options from a potentially infinite list of things someone can do to help them have a well balanced life.

You are the master of your fate, and so I hope you choose what you love, but for the love of all things holy I hope you learn to love more than just programming. It doesn't have to be something swiftcoder mentioned (obviously). Do what you love, and while you're at it, find new things to love too. When swiftcoder said "usual high school things" I think he meant there are tons of options in high school (and all throughout life, for that matter) to be explored (and many of us probably had some similar options, therefore the "usual high school things"), and you should at least try exploring some of them. Take a metal/wood shop class, join a club (you can start a robotics club and do a FIRST competition, for example), make a bon fire with some friends, learn to play an instrument, learn to draw/paint (I wish I would've fostered my creative side more, 'cause it would help me with making some games), etc. Of course I'm not saying you need to do those exact things, but what I'm saying is that you've got options to explore!

There are some things you get to do in high school that you don't get to do when you're older (or, there are things you can do when you're in high school and when you're older, but high school may be the best time to try it as I doubt you have a mortgage, family, full time job, etc to worry about). At least try some of them out! You don't have to love everything, and you don't have to be (and I hope you're not) a cookie-cutter jock!

I think we all spent part of our youth programming. Some more than others, maybe. But I honestly hope, for your mental well being, that that wasn't literally the only thing you did. It may have been one thing you loved most and did most, but I doubt, and hope, that wasn't the only thing you did. Social interaction is a very critical part of a youth's development (read any book on the matter). That doesn't mean you have to be the popular kid (duh)! But you should be getting some kind of social interaction while you're in high school! You don't have to hang out with the normal kids doing normal things, and you don't have to hang out with people every night. But don't throw away the chance to have some social interactions during a critical part of your mental, social, and physical development.

Being a well rounded person* will give you a head start in life and a much better hiring potential in the workforce. That doesn't mean stop programming, stop being a geek, stop following your passion. It means that you need to realize the world is a friggin' big place with tons to be explored, and that you've taken the opportunity to explore some of it!

*Gosh, people keep going on about being normal and how you don't have to be normal. You don't have to be normal! Being a well rounded person who lives a well balanced life is different from being your average Joe.