Drum - don't worry mate. I'm crap on the RT and I have a VHF licence for sailing - it's natural to feel intimidated. I do and it's because I have become used to nautical terminology and get vaguely embarrassed at the terminology used for flying - you would be laughed at down on the Solent if you said "wilco".....
Just practice all of the common phraseology and calls that you would make whilst driving your car or in non flying situations so that it becomes second nature.
Good Luck.