Personally, I have a fetish for socks of all kinds and colors. They get me so aroused that if I don't masturbate on a regular basis throughout the day, I walk around the whole day with an erection. Is this a normal fetish? I have never found it interesting to fantasize about people when I do my deed – only socks.
I'm not sure if any fetish is "normal" (or "abnormal," for that matter). They're certainly common, and are simply variations on human sexuality. However, the importance a person places on his or her fetish is important. In your case, I'm concerned that you fantasize only about these inanimate objects and don't seem to find other people sexually interesting. As you can imagine, this could make it difficult for you to have a normal sexual relationship with another person (especially if they aren't wearing socks!). To find an object sexy and to use it as a toy during masturbation is one thing – but when it becomes a necessity, that isn't healthy and would indicate a need for professional counseling if you want to have healthy sexual relationships throughout your life.