I have a very good job and I think well of the people with whom I work - and I still feel much like this. I have been doing something I never loved for over 20 years now...and I never intended to have a career in it (though now I do). I just wanted to have a steady income to support my creative efforts. But now I am supporting a family of 5, so here I am.
I am trying to make the best of it, but some days, it is very, very hard. If I also felt my co-workers were juvenile, it would be impossible. As someone who is responsible for hiring people, I suggest you try looking for a new job. I have worked in one of place that was "like highschool". Not everywhere is like that, and as long as you hang onto the job you have while you are looking, no harm in it & it might give you hope. Heck, you might find something with better pay and better co-workers. You might still be doing the same kind of work, but let me tell you, good pay, DID give me an extra 5 years of "not miserable". Don't tell ayone but your husband that you are looking. And even in a rotten economy, people are hiring.- and the fact that you are employed looks good to another employer. And just tell anyone who interviews you that your current position is no longer "a good fit." It's not a lie - it's a way of saying "I'm not happy" without being negative.
I will definitely be encouraging my boys to persue what they love though. I was all about arts and music and my parents, who didn't know anything about the arts, always told me "It's so hard to making a living at that." They meant well, but they were just saying something they had heard over & over. I know MANY people who "make a living" in the arts now. They DON'T make a killing, but they DO make a living. It's hard to make a living at ANYTHING. From what I see, love makes all the difference.
Good luck to you.