Hey DP6stealth. Welcome to the group. The innerwear feeling odd is common for a few days. The material will stretch a little after that. Here are a few questions: does it feel too tight or too loose? Some times (as I’ve learned) it can be a matter of penile shaping. After all we are all shaped a little differently. The company can make it customers for you. Also, for me hair makes a difference. Hair removal greatly affects my fit.
I hope this helps. If you want more personal or directed advice you can message me.
Good luck and welcome to Stealth!