Purling --- stitches are slanting

I’ve watched the videos and I thought I had it, but my purl stitches slant in different directions, and I don’t notice them looking any different than the other (knit) stitches. What am I doing wrong? I have the yarn in front, and am going down with the needle and wrapping counter-clockwise. Any help would be appreciated!

It sounds like more of a tension problem than a stitch problem. Nobody’s tension is perfectly even in the beginning. Don’t worry about how the stitches look right now. Just keep going. You’ll find that the more you knit and purl, the more your tension will even out.