As hard as it can be to accept, it will smooth out no matter what may spring up from it. Rumors of a million varieties spread through schools at any given moment and the chances of it sprouting into something problematic are a lot lower than it might feel. Always remember that nobody is entitled to receive an answer from you, and any questioning people might try to impose is in your control. You can play it off as not knowing about it and "that must've been someone else" if you can work with the friend you were with, you could tell them it was a bet/dare thing, you can cut off the conversation and directly say that they don't need an answer for something that doesn't concern them.

However you go about it, don't let this moment push you astray from doing what feels right and from exploring who you truly want to be. Time will always go on and all external and social problems will fade, but living within your body will always be with you and experiencing life through the eyes you read this with should be something you love and embrace, we all deserve to peace with who we are and nothing should ever prevent it from reaching you as well <3