Stropping, like shaving with a straight razor or honing, looks deceptively easy to do. They are once you go through a fairly steep learning curve.
Like PickledNorthern said, you may not have rolled an edge and the problem could be just the angle you are using. I have found through using a straight razor that keeping the gap between your face and the spine to 1 or 2 spine widths works for me. Any wider and you start to scrape the whiskers off instead of cutting them.
A good slick lather rich in water but not to the point of being runny helps tremendously too.
Most new straight razor users have had similar problems to what you are experiencing so don't feel bad or get discouraged. The learning curve is much longer than most people expected when they start down this road.
Bob