Couple of observations:

  • If you think you are not using pressure, you are.
  • Dull razors will give you good razor burn. The razor may have been shave ready before you stropped. Maybe it is not anymore now.
  • Aim for short, confident strokes. Confidence comes with experience, which comes with time.
  • The learning curve for straight razor shaving is measured in months, not days.

All of the above is based on personal experience, and may therefore be unrelated to your problem. Although I doubt it. Just hang in there, progress will come if you are patient, and do not mind blood in your bathroom.