Aircraft bodies are tubes that are designed to flex. The tubes are supported at the wings and it is when the support by the air to the wings varies that turbulence leads to a bumpy ride. Like any longish and slender tube, rod, length of wood, etc. held and shaken at somewhere near the centre, the ends can be seen to visibly wobble relative to the centre. That is why theoretically there is less movement at the wings of an aircraft. However, if you look at modern bus and truck driver seats, they appear to bounce wildly but in fact the intention is to dampen the extremes of movement - arguably, that sort of effect occurs at the two ends of an aircraft's body and you can see the movement relative to the centre section, as someone has pointed out - just like when you watch the bus driver's seat. The best advice you have received is to achieve a reduced state of apprehension. Most people do not register unevenness in the air unless it is rather pronounced and your description reads as if perhaps you spend the whole of each flight trying to detect "turbulence". This is not conducive to enjoyment of travel and must be very debilitating. Anything you can do to reduce or eliminate getting into that state of mind is advisable and worth while. I would recommend anything other than intoxication, but if that is the only option for you then try to choose the least toxic means available. It may be worth your looking into some of the better courses available for those afraid of flying.