Self-discipline is a must, it doesn't matter the project you are working on, the motivation goes down from time to time. Anyway I think you are young, really y

Self-discipline is a must, it doesn't matter the project you are working on, the motivation goes down from time to time. Anyway I think you are young, really young actually, so keep starting projects, one way to keep them interesting is to see those projects as solutions to problems and if that helps you out with something real that would be perfect (like a to-do lists manager). If you can't keep working on the same project for too long, well, don't worry, you've learnt english and you are smart enough to know some things at 15 (many proffesional developers didn't know how to program at that age, and even later). So try to study more, learn new things and eventually you'll start to create things. To be more productive try to exercise, that will help you to be more self-disciplined and it'll give you more energy.