You're clearly interested in operating systems. I hope you learn about them one day so you can contribute to one. You might want to start with, e.g. infiniband

You're clearly interested in operating systems. I hope you learn about them one day so you can contribute to one. You might want to start with, e.g. infiniband drivers, which somehow allow programs to communicate "directly" with hardware without having unlimited privilege. There's a lot more to OS design than a user/kernel dichotomy, and user mode can do more than you think.