I know I sound unconfident, but maybe ex-muslim girls would understand how it feels.
No, I know lots of Muslim girls in your position & can empathise. But the religion was spread by a man who had a lot to gain by disempowering the woman, not only personally but also to aid the growth of the religion. And it was quite a successful strategy.
I still feel scared though, b/c sometimes I say: what if I'm wrong? and that I'm sinful?
Yes, I went through that too - I just thought that I was a bad person because nobody else felt the same way so I must have been evil.
It'll take at least a year for that to wear off, until you are abosolutely sure you are right that Islam is manmade, only then will you have the confidence to shake the debris off.