You’ll feel that at first. I gave myself a 20 day challenge where for 20 days I’d create a model each day in about an hour or two (sometimes I’d get carried away). Keeps you from getting too ambitious and you’re always modeling something different. Some of my best models came from those sessions. Consistency is key and that technique really broke me out of exactly what you’re feeling. Now I feel like I can model almost anything.
If you’re lacking ideas, just steal them and recreate scenes. That way, you don’t have to think about it the creative part; just the technical part.