Chastity device discussions and reviews discussion

I’m using a Chinese-made device that features a silicone urethral tube and a metal tip. Insertion is generally smooth with very little pain, especially since I apply plenty of lubricant. However, once it’s fully seated, I get a pinching or stinging sensation inside. Pulling back slightly relieves the issue. Could the tube be too long for me and need shortening? Or am I just not yet accustomed to it?