Introductions discussion

I joined some time back, but I’m finally getting around to sharing my introduction. As a submissive guy, I want to train myself to be more well-behaved and hope to persuade my partner into taking on a more dominant role. Chastity looks like an enjoyable path for this. The issue is that I purchased the newest CB6000 model, but it seemed impossible to put on—my glans measures about 4.5 inches in circumference even when completely soft, so it wouldn’t fit. My length is standard, just apparently thicker-headed than most. Do you have any suggestions for devices that could get me locked up?