look, you're stammer has to be pretty bad if years of speech therapy couldn't fix it. if it was a mild disfluencey, you could fix it by slowing yourself down when you talk. there is only so much we can do for you.you've solved a problem I've spent thirty years trying to overcome.
i gave you the best possible solutions i know of to improve your speech (weather or not you have a stammer)If the only solution I can get is "don't have a stammer", a) you've just made yourself a fortune by curing the extremely weird ailment of stuttering or b) you can't offer alternative advice. If the latter, I accept it and sorry for wasting your time.
I'm no speech therapist, I'm a pick up artist.
odds are either your condition is fairly severe and thus not very treatable, or there may be an underlying psychological ailment that is causing the stammer (especialy since its onset was at a fairly young age) perhaps it was the result of a traumatic event you experienced at a young age?
have you tried seeing a psychologist? they might have greater insights into your condition.
if neither speech therapists or psychologists can come up with a solution to your problem, i don't know who could.
like i said, i am just a pick up artist, I'm no therapist.
however, feel free to ask any questions about the mindsets of the pick up artist. you are in the right place to figure out solutions for meeting women.