Welcome to the site, hon. It's good to meet you *hug.
First of all, let me say that while you're here, you'll be taken seriously. What you feel is what you feel, and only you really know how those feelings manifest. This site is a melting-pot for a vast array of people with a vast array of experiences, thoughts, feelings and perspectives. None of which are any more, or any less 'real' than any other. The thing about places such as this is that you can be totally unsure of yourself, utterly bewildered and not have the first clue about where to go or what to do... and then you read of someone's experiences and feelings which resonate so closely with your own, to the point where you think "finally, I'm not alone with this!".
And while that in itself may not decide your course of action, it does at least give you a sense that no, you're not crazy, and that in turn gives you a boost in confidence to work on your own feelings and in making the decision about what your next steps should be.
One thing you do learn from spending time around other people with similar feelings to your own, is that everyone's story is different, and there is no 'true' way things have to be. For all those who knew from an early age, there are equally as many folks, like yourself, who just didn't think about things like that at during those formative years. Everyone comes from a different background, with differing life experiences which may, or may not have drawn attention to their internal identity. Quite simply, it's not something everyone thinks about at a certain point in life. Indeed, some of the girls here didn't realise who they were until much later in their lives than where you are now.
My advice to you, hon, would be to just spend some time here, reading through the trials and tribulations our other members go through; their thoughts and feelings about how they relate to the world. Then see what resonance, if any, they have to the way
you feel about yourself, and how
you see the world. Jump in and ask any questions you feel you need to ask and generally get some feedback from folks here. The important thing is to not rush into one belief or another because you think that's the way something has to be, and if you don't feel that way then it's automatically wrong. It's good that you've given yourself some breathing space to come to terms with the way you're feeling. What I would say is to use that time to get to know more about yourself, and about how other people feel regarding the same issues, in order to come to whatever conclusions you feel are appropriate.
If possible, maybe think about approaching someone with experience of dealing with gender issues. A professional therapist. While being here may allow you to get a handle on some of the things you're feeling, such a professional will allow you to explore the way you feel on a more personal, one-to-one basis, and may facilitate the choices you make in the time to come.
But, for now, just relax, take some time to explore what the site, and the people here have to offer, and feel safe in the knowledge that you're among friends, and you have nothing to prove to anyone other than yourself.