If you think it's going to be weird,then you're probably right.If you're really confused,just talk with your friend about it, and work on trying to date another girl,if that doesn't work out or you don't like it,then you'll know.Good luck : ]
You said in one of your comments that she has the same feelings as you do, that she's starting to question her sexuality. If she's willing to help I don't see why you'd hesitate to not accept it, especially since that would be helping her too. Why should you feel weird kissing her since I see girls kissing each other all the time. But like a couple girls already said here, girls kiss a lot so just do it and if it goes good then kiss some more. No harm done. Let it lead to wherever it goes. If either of you aren't especially excited after your first kiss and kind of laugh about it, then just laugh if off and say like thanks, but it was fun anyway, wasn't it? lol! No need for anything between you two to be weird after that. Besides she offered to help you.
That's up to the both of you if it's 'weird' after you kiss. If you just don't let it become a huge deal, then it'll be fine. It helps if you make jokes, and turn it into something humorous, as opposed to something awkward.
I kissed my best friend who is also a girl a couple years back and we are still real close. It was a "dare" made by two of our horny best guy friends and we both ended up liking it.We just made jokes about it and it wasn't awkward at all.She's bisexual and I'm straight. There's nothing wrong with trying new things =]