Why worry about it? It's a hobby, not a job. If you don't feel like building right now, just don't build.
I sometimes go for years without building anything. If I don't feel the urge to build, I just don't, and don't think twice about it. And when I do get the urge to build, I build. It's pretty simple, really. Why worry if you don't feel like building anything right now? Who says you always have to be working on a project? If your hobby is a source of stress, you need to get a different hobby!
Build when you feel like, don't when you don't, and stop worrying about it.