I don't want my stepdaughter at a vacation. Is this going to be something I can relate to anyone about?
Why don't you want your stepdaughter away on vacation? Oh I feel like you must be saying this anger only.
She's too young to be away from home when she's only 16.
It is understandable to be worried about your children as they become more independent. but you also need to give them space to grow as they get older. Doing so gives the the knowledge and experience needed when they are finally on their own.
What if I don't want her to learn from her experiences.
Every person even a teenager has to learn from experiences, it is the only way we al grow and mature. Let go and let her live. This being overly protective about her will only cause her to be unable to cope with life when she does move out.