Sympathise fully with your predicament, I found myself in the same boat at one time. A sure way to rid yourself of the "radio fear" is to do as follows.
Sit down one night and draw a few lines between airfields on your chart. Then (in a private place!) talk through the RT out loud as if you are flying the trip. And then fly the trip backwards, and then assume you have to divert, and then assume the traffic is busy at your destination, and then carry out a go-around etc. etc. etc.
It wont be long before you find you have your own set patter which will work in real life too. (No two pilots give their info in the same order and you will have your own order that comes easiest to you).
One last tip, the speed with which you deliver your messages over the waves is not a reflection of your RT abilities. Some of the best pilots speak in slow/medium speeds but the info is all there and you will get the respect of the controlling authorities you are speaking with a lot quicker.
Don't be afraid of it and if you gst in a flap just speak plain english, at least it will avoid confusions!!!