Don't worry about cocking up your RT.
Fly Nav Speak
Commercial pilots drop clangers everyday. Stepping on read backs and the like. And for most when you take them away from there comfy IFR script they will be just as tongue warped as a 50 hour PPL flying VFR.
Enjoy your flying and after you have a PPL why not offer to take a controller up from the tower. You will have to let them do the RT just for amusment factor of getting the conversation round the wrong way. And them getting fustrated with there collegues.
MJ