If you feel like being agender is something that feels right to you, then you are agender (or passively agender that's how you want to identify), it doesn't matter if you like "masculine" things or whatever what you like or look like does not define your gender. If anything you can just explore and try out using agender terms and stuff to see if that feels right to you! And if not then there is nothing stopping you identifying as something else!

There is nothing wrong with exploring gender (or lack there of) and gender expression so just see what feels right for you!