This is a great question, because the future says that a situation like this will become very common with more and more people using this technology. Plus, it is hard to meet people in an age where pride and individuality is so important. Meeting people in real life that do the same thing you do, or play on a team you play on, etc. is fine for when you engage in that activity. But then, it's over and you part ways. With the internet, it seems like that particular 'other person' is avaliable all the time, and has no restrictions on what he or she can say. There is nothing held back, and it seems like you "see" that person for what he or she really is. That kind of thing is easy to fall in love with - the best picture that someone else can paint of themselves.
Of course, the fears of that "virtual reality" are present, and that is that this person is NOT who they say they are - a completely justifiable concern. I have a buddy online that likes to joke that he tells people he owns 200,000 sheep on the hillsides of New Zealand, and his family is worth millions.... only because no one can prove him otherwise. The point is that anyone can say anything, and for any reason.
However, your situation might be very true, and it could end up that you and this person never leave each other's side for the next 70 years. But that is only a speculation.
The reality right now, is that you are not in control of your life, being a child under the care of your parents. I am glad that you respect their wishes, and honor their intentions for you.
I have a suggestion: Sit down with your parents and tell them that you met this person online. When you sit down to tell them, bring with you come printouts of conversations you've had that have shown you that this person is who you might think he is. Get your parents on your side about this, and don't oppose them. Also, have a plan in mind that requires thier approval of possibly meeting this person. If you have to travel, have a time and place already established, so that they are not inconvenienced because they will be with you every second. Have travel prices, avaliable hotels, etc... whatever is needed if this is what you want to do.
Then, meet in a public place, bring your photo albums, etc., and insist that he also has his parents/guardians with him.
I've been very lengthy about this for 2 reasons. One, I know what online dating might become, and the potential/need for it. And two, there is no minimum of saftey that you should be doing. EVERY precaution is necessary. One one hand, you might not like him at all in real life, and you stop interacting all together. On the other hand, you meet someone that, if you stay the way you are, you might marry one day and live happily ever after.
Good luck!