Look on the bright side, least when you finally finds your
significant other, you can be sure she's not only with you because
of your tom-cruise-looks, or your glib tongue, but because you're
you. Believe that in this world, there's someone made for
you.
Well, I haven't heard how you sound, so I cannot possibly judge how
bad it is, but a speech therapist (like the thousand others before
me suggested) may help. So if it really bothers you that much,
spend some money, and go listen to what the therapist say.
Answer me though, if you ever meet an average jane with speech
impediment, but definitely a nice lady, will you fall for her?