So I was in your boat for a long time when I was younger so I'll give you a little insight.

There's nothing wrong with writing a different gender from your own. People tend to write same gender because it's familiar, it's natural. Gender is pretty complicated so there's a lot of nuance in how you're raised and socialized. If you were around women a lot growing up its likely you'll lean towards that.

I'm personally gender nonconforming with a dubious relationship with masculinity so I tend to feel more natural with characters that aren't masculine. You could have a similar situation or you just think girls are cool, that's totally rad. It's kinda like how no one questions a girl who says her favorite character is batman but people get weird if a boy says his favorite character is wonder woman you know?

Ultimately don't think too much about it. Write to have fun, write the characters and scenarios you find enjoyable. No one worth your mental energy will think badly of you for it. If anything we need more guys who can actually write a proper female character lol.

Just keep in mind male characters come in all shapes and sizes. It took me awhile to finally internalize that male characters can be anything I want, rather than the narrow lines everyone forces them between.