How do I make my own mirrors using regular glass?

Ok so I’m really pretty and I love mirrors…I have a lot of them in my house, all over. I’ve even paid to have my closet doors redone as mirrors.

I noticed one day when I was look at the back of a mirror that it looks like there is just blackish paint on it, and if you scrape it off with your fingernail then it’s regular glass.

So last night I was thinking…if you just painted the outside of your windows black would they become mirrored on the inside? Or is there a special kind of paint you must use?

If anyone could help me figure out how to make all my windows mirrors I’d be so so happy!