Artist and crafters can spend hours and hours, days and days contemplating about the difference between art and craft. The truth is, it is impossible to get to an agreement.
So, I can not tell you what the difference between art and craft is. What I can tell you is that the difference between art and craft for me is the following:
Craft is handmade object which can be used in everyday life and art is object which is there to look nica and/or inspiring. Art can be Craft and Craft can be Art.
Whether you want to call yourself an artist or a craftster, it's up to you... ;-)