No idea what to do with my PhD research
Don't panic. What you're feeling is very common: so called "impostor syndrome" (where you feel that you're not good enough to be there) is very common in academia. 

Talk to your supervisor about how you're feeling, and try to narrow down the focus of your research question. You have plenty of time still, but its important you take the time to understand exactly what your work is trying to answer, which will in turn help you understand where to focus your efforts (for gathering data, publishing papers, etc.).

Some supervisors are more diligent than others, so if you feel yours is too busy or not providing the help you need, don't suffer in silence but talk to someone else. Many institutions have some form of tutor system, or faculty position devoted to helping out students that are under pressure or struggling.