If any wan't to suggest me to my problem,

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Have you seen a speech therapist? This is probably something that can be improved with exercise and practise.

Sir,
First of all,Thanks for your valuable feed back...
As I contacted d doctor in earlier days, doctor had told me that my "Uvula" is smaller..
Can it be operated ?
I'm 23 yr's old now.

That's something to ask your doctor.