When dealing with something as personal and important as your sexuality, it doesn't feel good to have to hold it in. But that doesn't mean that the alternative is having a coming out "moment." I'm on here primarily to vent/discuss/think about my 2D sexuality so I get the chance to be open about it to people who have experience or at just curious to talk about it, so I don't dump exposition all over the people I know who weren't expecting/asking for/interested in it. That doesn't mean I won't talk about it with them ever, it just means I would try to weave it into conversation.

My parents know that I'm 2D inclined, specifically with a fondness for Squidward. We don't talk about the sex, but I think if we did, I'd be surprised how much they already figured out on their own. You may be surprised to learn that others have been observing your discoveries from the outside, even if they don't have the whole picture.

Coming out usually sounds like an event, but it's an ongoing series of interactions. I would say "Show, don't tell." You are still you. I agree with Unaluna -- seek out new people to share with and learn from, maybe an LGBT+ organization. I wish you the best on your journey!