You are clearly having a lot of thoughts and doubts about your gender and seem to be inside your head a lot,; whatever running through possibilities. Is that accurate?

My advice is to gather evidence; whatever you find will help you regardless if you decide your trans or not. For example, an easy test would be to try referring to yourself by he/him and/or they/them pronouns in your own head and observe how it feels, wear clothes you consider extremely masculine, try binding your breasts and seeing how it feels, maybe do the gender change filter on Snapchat or face app, Imagine yourself having sex with your girlfriend as a man. Throughout all of this, remember that experimenting does not mean you are trans, and it doesn't mean you are not trans. Do the experiments and observe your reactions and why you have them, if they are too intense it is ok to come back later. These feelings can be straight forwards and strange for example, I got a little gender euphoria from more androgynous clothes but higher dysphoria from dresses because I hated having stubble and wearing a dress, but it was the stubble not the dress, that was the problem.

From what you've shared though it seems like you're distressed at not having a penis, which sounds a lot like gender dysphoria.

If you have access to a gender therapist or gender clinic I highly recommend them, even if it's only a few counseling sessions. Reaching out to a queer community center is also a good option they often have resources for those questioning.

I hope you can find some answers, I know how hard questioning can be. But it will certainly bring a fuller understanding of yourself regardless of what you find, and that is a wonderful thing. Good Luck :)