I am getting baptised in 2 weeks.?

I have to give a testimony in front of the congregation and I am really nervous. I know that I have accepted Christ in my heart, but I am not good at speaking in front of people and I can't explain how I feel. I do believe there is a God, and I believe that one should confess their sins. I am hoping that being baptized it will bring me closer to Christ. How does one handle the awkwardness of speaking in from of others, of finding the right words to say?