There´s a book called speech is a river that make´s this same question. The woman asked an older man on a elevator; ¿Do you struggle to talk? ¿Does it take your conscious effort? For me it does. At first the older man though she was joking and when the woman told she was serious he respond: ¿Does talking demands your effort? Well If that would be the case I guess I would not talk at all. Fluently people talk without effort. I prefer to call it fluent rather than "normal" because blocking does not make you weird or anormal. You are still normal you just block. We have been struggling with talking our entire life. We see it like a sport that we are just bad at it. We have to train and practice in order to get better and speak fluently. The thing is that speaking does not work like that. Is not like improving at tennis. Giving your 100% effort on 6 months to have a better serve. That is why I don´t like (some) speech therapist. They teach you some kind of technique that need´s practice. They make you apply even more effort and control to your over control speech. Speaking is simple, spontanenous and efortless because we don´t hold the responsabilitie to it. The body does it for you because is already learnt. We don´t have to re-learn or "get better" at speaking. We just have to trust that our body will do the job. Know how, what and when to talk. Let go. Well.. Sorry for the long write but for the ending, on the book, the woman start writting because she could not speak freely, spontaneous and efortless but she could do it on paper. In time, fluency and naturality that come´s with the writting translate into his mind and way of looking at the world and she gained permant fluency speaking. She noticed one single thing that change his entire belief system; talking should not take that much effort. The same thing you noticed.