Getting into the military is not a simple issue of just getting work or as an escape from a difficult family situation. It is definitely not for everyone.
And I sure wouldn’t want my sons to join up unless they felt it was their vocation or really wanted to do that.
My nephew joined up, fought in Afghanistan, and now that the soldiers don’t have a lot to do, Facebook posts indicate a lot of partying and drinking.
There are all kinds of pressures in the services. The OP may not have the right nature.
Why should he be criticized if he recognizes that and doesn’t wish to join?
He hasn’t found authority as in his family, well modeled.
We can’t foist a vocation that they don’t have onto someone else, just because we think it’s the solution!
In time he can leave home. Prayers for his mother and him, for his Dad and sister. Special prayers for the Dad because he can’t leave as easily.
Of course the mother is stressed, but we mothers are supposed to be nurturing, not destructive.

In any case, prayers for all