Why does gender matter?

I’ve not been able to understand why it’s gender people go after

The entire transgender movement and all the messages within it (at least from what I’ve seen so far) could easily be boiled down to “be yourself”

But why does being yourself require a change of gender? Maybe I just don’t understand it

I’ve always seen gender as sign rather than a large part of myself

I can give birth… So what?

If I’m coming off as disrespectful I don’t mean to be

I’m trying to “educate myself” on this stuff and maybe stop being so horribly offensive