I can't decide which to use so uh

Not necessarily weird, but don't expect everyone you encounter to understand or be accommodating.

No. Not at all

No, I use 3 (could easily become 4) different names depending on how I feel and which one I like better at the time

Actually, that's not that rare for genderfluid people.. Might be difficult to communicate irl but I could imagine close friends would even be able to tell the difference after getting used to it. Maybe you also dress differently or wear your hair in a different way. And online you could just change your profile if possible - I know it's pretty difficult on imgflip, but you could still sign your memes or comments with your current name and pronouns like so:
Wite Rabid (it)

Can I be genderfluid if I never feel like a girl?

Of course! Genderfluid just means your gender changes between different states. It doesn't say anything about how many or which genders you fluctuate between. For example, if someone feels like a boy on some days and non-binary on others they might be a genderfluid enby-boy or something like that.

Luke, I am your father.

🤣🤣

Not weird at all

it's not weird, just make sure to remind your friends what you're going by that day :)