I think it is very positive that you say you know who you are and what you are and that is the truth you stick with and build your life around. There are many people who are not comfortable with either gender or identify as agender and that is totally fine. There are agender people who still would like to be in a sexual relationship and there are others who also identify as asexual. Any of those are totally fine too. I think the first step is to know you you are and that you already do. Then you can maybe try to get more information to try to understand what you are experiencing and other people who have similar experiences. I get the impression that you not only know who you are but are also comfortable with it. If however you have not yet reached this stage of acceptance you can maybe work towards that. You might want to have a look at our subcommunity for LGBQ+ to find like-minded people and discuss your thoughts and emotions around the subject in a safe space. You might also find some answers to questions you still might have. I wish you luck on your journey.
If you never identify as boy or girl, and any gender doesn't feel like you at any time, then your idenity is probably agender. Agender is a term that indicates people who don't identify with any gender at all, who just feel like they are an individual person, and no gender has anything to do with who they are.