I don’t think its just you. I had the same problem too, and looking at the projects on Ravelry, a LOT of people found them big.
It was only a few days ago that I finished mine, using 4 and 5 needles, and posted them on Ravelry. This was part of the comment I wrote there:
[COLOR=“Blue”]"I knitted the smallest size, but these are quite large. I finished one boot and decided the leg part was just too big, so frogged back to where the instep shaping ended, and re-knitted using a size smaller needle. Looks better, but definitely not 0-6 months size; more like 6+ -12 months.
Next time I will use smaller needles from the start."[/COLOR]
So I used 4’s for the sole, had changed to 5’s as in the pattern for the instep, but when the leg came out so wide I frogged back to the instep and redid the leg using 4’s. Next time I’ll do the sole in 3’s then when I change to the main colour for the rest of the boot I’ll use 4’s.
Oh, forgot to say, I used Berroco Suede and my tension is always neither tight nor loose.