As someone who has over 50,000 miles in planetrips...
Airplane rides are typically very tame. They are generally smoother than a car ride would be. The only time you get turbulence its very minor shakes, and going over a railroad track in a car is going to be about twice as "bumpy" compared to 95% of turbulence, and it feels exactly like going over railroad tracks. So there is nothing to worry about. Hitting a pot hole in a car is more dangerous or abrasive than any turbulence.
Seating is like old style movie theater seats. Typically small, uncomfortable, lined in a row. Gets uncomfortable for long periods. Depending on the size of the seats, its usally 3 lined up, then aisle, then 3 lined up. Or on bigger planes it might be 2 - 4 - 2 with 2 aisles.
Regarding things like geforce and feel of movements, usually the only time you feel anything during a plane flight is take off and landing. Usually when they punch in the after burner in the airplane during takeoff (not really an afterburner) you will get pushed into your chair a bit, but its not much different than flooring your car... But its only for second or two and the acceleration dies off and you will just gain speed at a steady pace. Landing same type of thing. You land, and the airplane has to step on the breaks. So it will feel like a car when you have a driver slam on the breaks, you will be pushed forward in your seat against the seatbelt a bit. Again, if you ever have driving in a car, the feeling is similar.
All in all, you are freaking yourself out... I used car in my example above because everybody's been in a car.
However, its more accurate to say its more like a boat ride. As a boat is typically more "free flowing", it might rock a bit from side to side due to waves hitting the side of a boat, and hitting the throttle or letting off gives you a bit of a feel in movements like a nose up/nose down of the front of the boat. Just think of it like that. If you ever driven a boat onto a car/truck trailer, and you get a jerk as the boat goes from water to being supported by a trailer, thats the feelings you feel from going from runway to air...
Trust me, plane trips are tame... If they were as "extreme" as your mind is making it out to be (in your fear) nobody would do it... Its not a space shuttle trip. Generally plane trips feels like going out for a boat trip on the lake, peaceful and serene. If its a day trip, I suggest the window seat. Because you can look out the window to coordinate the feelings of the plane movements (roll, yaw, pitch) to the outside world, and it will help with orientation, and I'm guessing you will think its great!
Oh btw, I'm freakishly afraid of heights, and you don't get that feeling at all in an airplane...