One of the things you could do is try and intern at a tech company during the summer. The main benefit is that you'll be able to see how different technologies are usually put together to make a product, and will also learn some useful professional software development practices along the way which may become handy in the future in case you ever decide to do a startup.

Since you're not in college yet this may be slightly difficult, but as long as you have put together a portfolio of interesting things you've worked on (which you clearly have), it shouldn't be a problem.