One tip: Ignore everybody and keep creating. If I'd done that at 15, then I wouldn't have started to doubt myself and stop working on ideas that later turned out to be very prescient.

The most important thing you should do is the thing that's most important to you. Be sure it's not defined by other people's opinions.

There will always be people in life like the guy who replied "While it is impressive to see another 15 year old programmer (I've never met one in real life even though I've been to three schools in two different countries (I'm a expat kid) ), the actual programming skill required to make games like these are little to none and truthfully i'm not overly impressed."

Ignore 'em and keep working.

EDIT: Oh, I should also mention: don't let the praise go to your head. Another mistake I made. In general, it's it's a bad idea to compare yourself to anyone else -- whether feeling smug and superior that you've accomplished all this at 15 (surprise, I know your secret!) or feeling weak and inferior that you're not as talented as some other person. They're not you, and you're not them. Relative comparisons like that don't matter one bit. Instead, it's far more advantageous to always be comparing your current self to your past self. That's how Carmack became so incredibly good, for example. He didn't wait for anyone to surpass him; he did it himself. That's only possible if you believe you're not as skilled as you could be, i.e. having no ego. Nor did he let people convince him he was wasting his time back when he was working on his early projects.

It's complicated. Just keep working.