Ok, now I'm going to sound like I'm contradicting myself, but my recommendation to teenagers is to not be so quick to label yourselves. Just see where your feelings take you; it's not necessary to label yourself as bi or straight or gay at this point. Keep an open mind about who you find yourselves attracted to (and why), and give yourselves a few years to explore. NOBODY knows who they are until they are well into their 20's, and some people STILL don't know who they are. Give yourselves time to figure it out.