Is our tongue the issue ?

Is our tongue the issue ? I'd been reading out loud for almost a year now and taking notes about my stuttering, tried different methods and came to realized that I personally get stuck with words that start or end with r, this is where my tongue would go all over the place and not allow air out, which makes me stutter a lot. Kind of like an manual car and an automatic car, whenever I'm about to get stuck, I manually would move my tongue the way it would go, I'd tried this method while reading outload and when talking to people and it seems to work. Has anyone else done this?