Confused Forza 3 newbe

I’m a senior citizen new to video games but was looking for something to entertain and keep my mind active. Purchased Xbox 1 all digital which came with Forza 3. Have installed and played for some 5 hours but never had opportunity to chose a car or control any aspect of the game. I’m continuously in a Lamborghini racing or dodging other vehicles on the route. Am I earning my way or is this never ending? Looking forward to choosing my own car and doing some mods!!
Thanks for any advice or assists.

Hi there.

you should able to choose your first car within the first 20mins, i see the video you posted , so here is what you missing… open the map see the yellow circle on the map ? set a way point and go there. then the game will progress…
OR just in case take a look at this

and have fun.