Monotone singing voice?

I really want to be able to sing for my own pleasure. I've played guitar for ten years but I've never practiced singing because I've always hated my voice. Now, I'm ready to practice but I sound so monotone. I have a VERY small range. My tone isn't bad but I just can't figure out how to sing other notes. Is there any way to learn how to actually sing or am I just out of luck because of the voice I was born with?