Are you looking for a virtual or a real world coven?
There are many virtual covens that are accepting members on this site.
Real world covens can be found on witchvox but they do come with some warnings. Most covens have an age minimum due to the laws of teaching religion to minors, this could be 16, 18, 21, 25, or another depending on your state, country, etc.
A coven is also not the place to just escape and you certainly should not just accept any coven because you are desparate to get away, a coven choice is an important decision, especially if it is in the real world.