And that's why I'm afraid to tell my parents I'm even bisexual.
But to the question at hand, no I don't think you need to participate in sexual activity to be considered a certain sexual orientation. You have an attraction to a certain sex (or sexes in some cases) long before there's any sexual activity going on. Just my opinion.
Well your gonna have to eventually tell them. When you feel comfortable enough to tell them do it. Don't rush into it, take your time. You can't help what you are so don't feel as if it's your fault,just be happy :thumbup