Most people your age are looking for a permanent relationship. If that's what you want, I wouldn't advise trying to work both sides of the fence. Regardless of our sexuality, most of us see people that are attractive every day but once we make a commitment we live with it. The only difference in your case is that you have twice as many choices as most of us at the start.
I would advise you to keep an open mind until you find one person you can develop a strong bond with and drop your anchor there. After you make a commitment, you have to accept the idea that, "everything that glitters isn't gold."