Intimidated/turned off when a woman straddles me?

Has anyone had it when a woman jumps in your lap and straddles you and expects sex that it is a bit of a turn off and intimidating? I find I cant see what I want to see, my movement is inhibited and my ability to even physically and mentally escalate goes. it seems to be a key issue I have consistently with sex and often is the first act that leads to things fizzling. Does anyone else have this experience or have advice?

Id much prefer she assumes a position like bending over and preparing than do that it feels less like Im being crushed and overwhelmed.