welcome to hcm,
i am also an squint
specialist and according to your history i think you have intermittent exotropia
i.e. your eyes goes outwards intermittently.
as you are using minus spectacle means your accomodation is good i.e. you can see near objects nicely and exercise does not work in your case,
so if you have squint for more than 50% of time of a day and cosmetically disturbing you , you can go ahead for squint surgery which is only option in your case.
if your squint is less than 50% of time of day and not causing you cosmetic problem then you can wait.
because at age of 23 squint surgery is not for vision it is for cosmetic purpose only.
according to my advice if squint is giving you poor cosmetic appearance you can go ahead for surgery. it is extraocular surgery will not cause you much pain and other problem except redness
for few days.
squint surgery done by specialist gives you very good result in case of intermittent exotropia
you can ask me further questions