a basic truth behind the reality we play in is that our brains are malleable.
no matter how mentally tough you think yourself to be, you, too, are able to be slowly and intentionally crafted to suit the whims and preferences of your lover.
there are so many ways to do this, but start with the easiest: repetition paired with positive reinforcement.
for example, say you're a submissive for a Dom who desires more flexibility and openness from you. here's where i'd start you.
write a list of at least 10 ways you could become more flexible, in present tense, first person. i.e., i am very easygoing about what i eat and when! i am easy to please. i dont need to know what to expect.
record yourself repeating these mantras. during this recording, repeat each mantra at least 20 times. do it slowly, pausing deliberately between each repetition.
as often as you possibly can (bare minimum is 3x week), play the audio. listen along. repeat after yourself.
while you do 3, practice touching yourself. where does it feel soooo good to touch? pinch your nipples or tweak them just barely. edge, if you edge. overstim if you like that. get on your hands and knees and bark while you listen, if you like that.
other times, make it more studious. get out a notebook and do 3 while writing the mantras out. let yourself get into a flowstate here.
if you have a Dom already, involve them. show them your mantras and ask for ways you could improve them. repeat your mantras while they fuck you, or edge you, or hit you, or whatever it is they do to you. play your recording during it.
this is a bulletproof, seriously real way of altering your mind. what happens when you do this is you are literally rewiring your brain. each repetition of each mantra deepens the hold that statement has on your mind.
what we repeat is what we believe.