For God's sake someone help me please ( Im soo fed up )

For God's sake someone help me please ( Im soo fed up ) I have a job that require chatting from here and there but I can't even speak 3 words without blocking and stuttering. even customers feel uncomfortable while talking to me and I get very anxious during conversations which makes it 10 times worse. my boss also don't like it when he sees me stuttering with customers because they feel uncomfortable and it's not good for business. it's sad because my job doesn't require talking 60% of the time but when it does , I do a horrible job.