If it is your first semester, then it seems like you should be taking very general classes that can be applicable to any degree. Perhaps you can look into changing to something else.
If you just don't like school at all, then now is probably the time (with only one semester in) to bail out.
My suggestion would be to go speak to a counselor. Many of them are very helpful and deal with these sorts of things all the time. It seems to me that many colleges can extend the allowable time to complete a degree. There are all sorts of reasons for which people might unforeseeably need to take a semester or two off, so those requirements often are flexible. Perhaps you can take a semester off and think about things, get a job, wander the country...
I wouldn't look at a degree as something to fall back on. An associates degree is pretty basic and will serve as a good platform for anything else you decide to do. Criminal Justice, also, can be broadly applicable. It can lead to a career in education, social services, law enforcement, journalism, etc.
Another way to look at it is to consider what you would be doing instead. If you have a dream job lined up, then I would probably say to go for it. If, on the other hand, you have a McDonalds job lined up, then stay in school.