I feel like I would never become a women.

[No1]

Stop comparing yourself to others, that's the first thing. It's normal to feel anxious at that time since it's when you start feeling the brunt of adulthood, but be sure to water your own grass until it turns green intead of being envious of others'. Someone up there put it perfectly, being legal is not necessarily being an adult.

Secondly, and I don't mean this in a condescending way, you're still very young, you have time. As a 30 year old, I can tell you, most of us don't know wtf is going on and just figure it out as we go. You always think you'll have to have your shit together at a certain age like it's some sort of life achievement you have to check off, but it's not like that at all. There are times where I still feel like a 15 year old, the only difference is we have been longer here so we have more experience on how to deal with certain things, but we never stop growing and maturing.

Don't sweat it, who knows...maybe the people around you look at you and think "she really has got her shit together". We're all freaking out in the inside.