You're a teenager, so don't worry too much about that. Most teenagers experiment, and women aren't like men when it comes to the same sex - we can easily be attracted to another woman, and kissing a woman feels damn nice tbh.

But preferring to see a naked woman rather than a naked man sounds a bit odd... but the female body IS aesthetically more beautiful so it's not really that strange lol.
Having the "I wouldn't mind" mentality about other women isn't unusual for straight women either.
I'm straight as helm, but I wouldn't mind making out with another woman (done it many times before lol), I would mind having sex with one though. It wouldn't disgust me, but I'd prefer not to - just out of principle. I tell my bf that I'll have a threesome with him and another woman when he agrees to have a threesome with me and another man. *giggle*

Seriously, I wouldn't even give it a second of thought. Be with whoever you want to be with, your orientation will sort itself out naturally - no reason to scratch your brain over it. You could tell your boyfriend though, most men would be thrilled about the thought of having a threesome or watching two women or anything like that - so it could be a chance for you to experiment and for you all to have some fun. :P