How to overcome stammering for a public speech

[virgo123]

I have been a stutterer since age 6.
I guess it is to do with inheritance becoz my father stutters on phone smtimes and his couple of brothers stutter a bit too. even my mom's brother stutters.
but then my mom says i aquired stuttering disorder wen i was six, and i had fever at that time and was acting wierd. the fever was smthing to do with a fear of a snake i had seen at that time.
i went to a therapist wen i was 13, and he told me to practise reading newspapers by streching the first phonetic of each word for one second i guess.
for example, "I aaaam a veeeeeergo(virgo) aaaaaand(and) aaaaaaastrology eeeeeees(is) fuaaaaaaan(fun)". I used to practise for almost half an hour a day. Alas! it showed very little effect on the disorder.
After that i changed my school(coz the previous school was really lame :P ) and the environment in the new school was really cool and i almost lost stuttering except during few occasions where i had to read out poems in telugu to my sir.(may be because of stress and fear). i also had won award for teaching to my juniors, mathematics on the teachers day and there was no stuttering even infront of a big audience. everything went fine for 2-3 years.

now i am in my final year of graduation and hav faced a lot problems during seminars and presentations or while asking doubts to the professors. i am pretty normal during normal conversations with friends but the problem arises when i try to explain a concept or a news or a joke to people who are unaware of the concept/news.
one more thing i obsevered in my stuttering is that i stutter infront of people whom i think are a bit superior to me. not exactly superior but ppl who are not so dumb to ****ysie things i.e intelligent enough. with strangers( except elders/higher officials) i am pretty fluent.
very recently my professor too advised me to get rid of it since its going to be a big hurdle in my future professional life where probably i have to present papers in conferences and things like that. it seems that, as said by my professors, even in my stuttering i am pretty good at explaining concepts during presentations. (dont know if they said this just to boost my morale). the thing is there's no blockage of thinking rationally/logically during my stuttering.

hope the above things adds to the database of properties of stuttering.
i would also welcome thankfully, suggestions in getting rid of this problem from people who are in practice.
i hope its not a problem replying to such an old thread.

i stay in mumbai

thnks.