I'm feeling like I'm not fully understand what degree of musical creativity is considered to be creating original content or inspiration.
When a musical idea "jumps in my head" it sometimes remind me some other song I heard before. For example today I had a 8-bit music idea, I've even played with it in my head, trited to form it but it kept constantly remind me to some 8-bit tracks I've heard before, I think they were from Mega Man. There were parts I wasn't even sure not just a "well remixed" part from one of the songs or a deformed part of an existing melody. And there was a melody part which was very similar to an existing one.
Last time I wrote a song in MuseScore I was trying to get a good sounding melody and when I got one I liked I was like "this melody is familiar..." but I can't even name a song where I could heard it. I still don't know if it's my idea, or it's very familiar because once I heard a melody and it inspired me or just "got lost" in my passive memory.