Hmm, I think that's normal. I do something slightly different, though. Even before I pick up my needles, I sketch out a design for a garment. After that sketch, another idea pops up and another. Lol, then I become overly excited about each garment that I don't know which to start on.
I've got three garment ideas and I'm having issues deciding on which to knit first. The first one is a panda hoodie with ears and a pouch, the second one is a hooded cloak for a steampunk convention in September, and the last one is a nerdy Pokemon inspired sweater dress.
I guess I could always start on that sweater dress since I have eight skeins of purple yarn.