<human>: Summarize the given text in a few sentences.

I have been protecting my little sister since the moment she was born. We had an abusive father, and I did everything I could to protect her from that. We rarely speak to him now, but I never stopped being protective of her. 

Next month, she moves to one of the biggest (and most dangerous) cities in America to go to her dream college. I absolutely cannot stress how proud I am of her and how excited I am for her. I think it's so amazing and wonderful that she gets to go on this amazing adventure. But a big part of me is still terrified. 

My sister is physically very strong, and has been since birth. Because of this, she thinks she's invincible. She's young, and I know this is a common affliction amongst teenagers, but she is not as tough as she thinks she is. I'm worried that she will assume this strength will save her and will get herself into potentially dangerous situations.

It's not that I don't trust her to make intelligent decisions, because I do. I just know how scatterbrained she can be. Half the time, she forgets to look before she crosses the street. Most of you have probably assumed which city she is moving too, and will probably agree that it's not the place to be an absent-minded pedestrian. 

I have a lot of other concerns and they are honestly keeping me up at night. My brother also lives in this city, and that helps. But honestly, he's in his own world and I don't know if I can rely on him to keep an eye on her. 

I know she's a smart kid. I know she's going to be fine, but I can't stop worrying about it. How do I put a stop to the mother tiger syndrome?
<bot>: My little sister is moving across the country. I'm excited for her, but I've been protecting her for her entire life and I can't stop stressing over the potential dangers of her new city. How do I stop worrying?