Do you even "User Interface Design"?

I am a programmer. By no means would I say I am a designer. I know a few principles and a thing or two about typegraphy. As a result, when designing user interfaces, I really do not know how to start and how to even do this. At work, I don't have this problem, as we have a corporate design. But for my hobby projects, the struggle is real.

How do you (fellow programmers) go about making a useful user design for websites and web applications?

How do the designers among us go about designing websites and web applications (very roughly)? How do you come up with a structure, who or what inspires you?