Your sexual orientation exists on a continuum which is a range of how much flexibility you have in expressing yourself. Although it may be common to think that you are either straight or gay there may be an in-between. If you are interested in where you fall on this spectrum check out the link below provided by Dr. Robert Epstein. He is one of the most distinguished research psychologist in America.
Here is the link to the Epstein Sexual Orientation Inventory:
http://mysexualorientation.com/