In general I think if you are very unhappy it makes sense to change things up. It is possible to do a PhD later in life if you want to. It might help you to ch

In general I think if you are very unhappy it makes sense to change things up. It is possible to do a PhD later in life if you want to. It might help you to change the area you live, get a job and see what that is like. It will help you see what is good and bad about academia and just working a normal job and that will let you make an informed decision about how to proceed. Also I agree totally the interactive theorem proving is the future.