Keep it.
I also switched from Windows a few years ago, and the first few months were a struggle. Learn the basic keyboard shortcuts and everything becomes much easier.
e.g.
press the power button, let go, then
- return to shut down
- s to sleep
- escape to cancel
Press command and
- tab to switch between apps
- ' to switch between windows in the same app
- q to quit an app
- s to save
- shift s to save as
- x,c, v to cut,copy and paste
- o to open a file
- space to open a small spotlight window - then type the name of an app or file and press return to open it instantly.
press function and delete to do a forward delete
in the finder (same as windows explorer):
arrow keys move around, type the first letter of a name to jump to a filename
press command and
- down arrow to open the selected file or app or folder
- up arrow to move to enclosing folder.
- n for new finder window
- shift n for create new folder
These are just the shortcuts I use the most. Try each one out, and just remember the ones you find most useful.
Yes it is a learning curve, but I love my mac now.
And I strongly recommend installing BootCamp. It's free, and now, while your HD is quite empty, is the easiest and quickest time to install BootCamp. It will give you more confidence, knowing you have something to fall back on.