Just because you enjoy looking at women doesn't mean you actually want to date them or have sex with them. A lot of women (maybe most) like looking at other women, either because their nice to look at or to compare themselves. Even for heterosexual women, women's bodies are much more pleasing to look at than men's bodies--sorry guys. Look at a woman's magazine, like Cosmo or something like that, they are full of pictures of beautiful women advertising products. That's because it appeals to women who are looking at the magazine.
I wouldn't worry too much about this either way. If you find that you just like looking at women, that's normal for a heterosexual woman. If you find that it's more than that, nothing wrong with that either.
Bisexuality is more than just finding both sexes attractive. There are romantic and sexual feelings that go along with it. Those are what you need to figure out for yourself.
I hope this helps clear things up.