I mean, design isn't development, it is so much more fickle than just programming or developing something. Companies hire designers because they have experience solving problems and can translate what the client is saying into a solution. I'm not saying you can't do this at 14 but yea, it's going to be hard.

Your best bet is to try and make a product that people will use and throw it on the various app stores, it doesn't matter who makes those as long as they are great. Once you make things go to meetups and do a show and tell, but don't let being 14 become your identity. If you just continue making things, everything else will fall into place.