Interesting. I also have this but minus the personification. Numbers 0 to 9 have different colors for me, and also the entire alphabet (sometimes I will accidentally write a number instead of a letter because they have similar colors). I can also see colors when listening to music or any sound, but not exactly like synesthesia (they actually do see it, like it's right there in front of them, while i just see it internally).

Don't be worried about it, and I doubt anyone is going to think you're crazy. Just think of it as a gift. The rest of the world doesn't see what you see, which is sad because your world is filled with color.