FYI, you have 3 clipboards in X11. You have your standard clipboard usually used with Ctrl-C, Ctrl-V, like in Windows. You also have your primary clipboard, which copies any text you highlight and can be pasted with middle mouse button. The secondary clipboard is typically not used. If you don't like the middle mouse paste, stick to the way you are used to. I learnt to make use of the primary clipboard and find that I always realise just how much I miss it when I need to use a windows system.