MCDzienny

When ever I play on a sever I have trouble typing c or v at first it's all fine then afte rlike 10 minutes the keys stop working and the v key just loads some message I said before, I'd love some help please, thanks.

This actually sounds like a problem with your keyboard, and not Minecraft. Check to see if you can use those keys in Notepad first, then reply back.

Jup. Keyboard problems.
You should buy a new keyboard. (or reset)

First thing to do, take out the keys in your keyboard. There may be dirt, or water under there. If you dont feel comfortable taking them out yourself, get someone to do it for you or take it to a repair place. All in all, you'll probably spend less money on a new keyboard than getting it fixed.

CTRL + C will copy your selected message.
CTRL + V will paste the message (hence you said it loads some old message).

So check you're not pressing control when typing, or it isn't stuck down. Also make sure you don't have any settings like num lock or function which can make things act weird.