U know I am sorry for my hard words but if he is such a bad guy you he should not be allowed to impregnate you. You don’t wilfully establish such relationship with a person who is bothering you or disgusting you or for whom you have been thinking to leave.
Anyway, you need to sort things out. Not every way can be your way , does not matter if you like your inlaws or not you will have to get them and get your own family involved. There is a limitation to which someone as an individual can do. Drug issue can not be taken care of by an individual pregnant woman , you need support ! Above all you need to determine and set your priorities in life and deal with them accordingly.