any moment which includes one person or more who is/are willing to listen to you as you share something about can be a potential moment to come out......
but "potential" moments are not the same as the "right" moment to come out,
the right moment to come out is when you are pretty sure about your orientation....
coming out for most gay/bi teens is the most difficult experience they life, for the simple reason that when we come out.....we prepare ourselves for the worst which can happen after we come out.......make sure you keep in mind the worst that can happen...and that you can deal with whatever happens.....be strong always and nothing will hold you from being happy
only you can understand if you are doing the right choice or not....all the rest of us can only support you in what you decide to do
I wish you the best of luck

loads of love,
Keith