How can i change my singing voice?

Adria, I can't help you with a "voice changer" but I can tell you that if you work on improving your singing voice you will be able to sing well, and you'll feel really great about your accomplishment. All it takes is working with the right exercises, and learning from a vocal coach that knows what he/she is doing. Anyone can have a better real, authentic voice, that is your own, not something mechanically altered, which doesn't sound real. Even though you may not know any good vocal coaches, or you may live in a smaller town or city where there are none, you can still get this kind of quality training. And what I'm talking about is learning to sing like you speak, which means, for most people, not an operatic voice, but your own natural voice. I recommend that you check out the websites of 3 top notch, in fact, these guys are at the top, of the field of "speech level singing", and they are: Brett Manning, Roger Love, and Seth Riggs. If you want to learn to sing, learn from articles, CD's, books, and other training tools they've created, and I promise you that if you work at it, you'll not be disappointed.