Believe me you are not alone. I think I take more time picking out the pattern, then the fabrics only to change my mine a couple time and then go right back to my 1st plan. This takes me more time than making the quilt itself I think. Then comes the choosing of the quilting patterns. I can't tell you how many times I'll have my layout all figured out only to come back and change a couple of times. Just did this the other day for a bargello I have hanging on the rack. Thought to do an E2E and then just recently decided to do the border separately. Now I'm thinking of going back to the original plan.
So you see, you're not alone by any means.