Ashamed of what? It's A-OK to have sexual feelings and, for that matter, to watch porn. Your porn viewing habits are not unusual among women, especially the gay men; in fact, a lot of gay porn you find online is usually written by women (something my gay friends will complain about at length if it comes up). You're obviously not conflicted about your sexuality, so I'd say you're good.
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I wouldn't worry about it. I enjoy watching gay and lesbian porn too and I am also a straight female with a satisfying heterosexual sex life. For me i think part of the turn on is that such types are something different and it's a turn on to watch.
I am the same way! I am totally straight, but only enjoy girl porn... I'm glad to know I'm not alone :)