Well... I came out in my old school as bi, and have only just recomeout. How come? Are you considering going back into the closet?
Yeah haha. I've came out as lesbian then went back into the closet for a while cause of the change in environment, and now I'm back out as pansexual XD. Honestly, now I don't care who knows about my sexuality, but I just won't go around shouting "I'M A FLAMING HOMO!" and getting in some possible homophobes that could make drastic changes in my education.
Its possible for someone to go back into the closet after coming out. There are multiple ways to do that, but yes it is possible. Why do you want to go back in to the closet, though? Did you get some bad reactions or are you afraid of everyone knowing? I just want to point out that you don't need to come out to everyone just now. There is such a thing as being partially out. There are many people that are out with family, but not with friends or out with friends, but not at home. Don't feel like you have to be either all the way out of the closet or all the way in
Me, I was out to everybody important and many people just knew, then I moved across the globe and I am 100% in the closet and hating it.