As someone who is close to living half my life post-transition, I wouldn’t say it ever went away completely for me but I would say it doesn’t bother me anymore. Because like, so what if I’m not ‘really’ trans? I’m clearly and obviously happier now. I think that fear, for me, comes from on some level believing that if I find out I’m not trans that means I’ll have to detransition… a totally cis thing to fear 🤣