Dear Ronald,
Thank you for candidly sharing your struggles, and thank you too, for your passion for space.
In my own circles, "Space Intern" is a title worn with pride, and being a "Tech Geek" is nothing less than a badge of honor. Don't forget—the world's wealthiest man, Bill Gates, is a self-proclaimed tech geek. So is NASA Administrator Michael Griffin. And so am I. So, when your classmates tease you about your love for space, just remember that there are thousands of people just like you all over the world—and we understand you. Furthermore, never forget that it is only those who possess true passion and unwavering persistence who go on to achieve great things.
As for your occasional seizures—yes, they may indeed prevent you from becoming an astronaut. But ultimately, epilepsy is no different from many other common medical conditions. You may need to take prescription medication over the long term to keep it under control, but it will not diminish your intelligence, nor will it stop you from becoming a mathematician, an engineer, or a scientist. You could even design aircraft and spacecraft; even if you cannot personally venture into space, your work could still stand at the very forefront of scientific discovery.
Please remember: behind every single astronaut in space, there stand thousands of scientists and engineers.
Based on your return address, I noticed that you live in the Rocky Mountain region. Colorado Springs happens to be the headquarters of the Space Foundation—an organization that runs a great many programs—and I strongly encourage you to pay them a visit. If you are willing to make the trip, I'd bet you'll return home with a whole box full of cool goodies: pens, posters, pins, paperweights, and other items perfect for science fairs. I can say this with such confidence because I serve on the Space Foundation's Board of Directors, and every time I visit their headquarters, I bring back a box full of cool stuff myself!
If you do go, you are sure to meet kindred spirits at the Space Foundation headquarters—people who couldn't care less about the snide remarks of foolish classmates—and you will share a wonderful time together, however brief that time may be.
Sending you my very best wishes—from here on Earth, and across the universe.
Neil deGrasse Tyson