The reason I asked about where you were holding the tail when casting on is because possibly if your strands were reversed, it might affect that first stitch.
The first/last stitch is always looser than the rest--just hold everything a bit tighter, give it a little tug and move on. The important thing when you are learning is to just keep going--don't worry about perfect (if there is such a thing.)
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry