I am so very sorry for the loss of your dd op 💐
Op many sixteen years old boys are awful who have had input from two parents and who have been in ft school, and who have not suffered such a significant bereavement.
Your ds has had significant disadvantages in his background but it doesn’t help him or you if you beat yourself up about this. The point is, what is going to happen from now on.
I agree with pp that it would be good if you are in a position to move and make a fresh start, perhaps near other relatives, but if that’s not possible financially, then could you reach out to the army cadets in your area if you think your ds would be interested?
If you put your postcode in to this form, it will show the nearest detachment to you:
https://armycadets.com/
There is also some excellent advice for parents on this site eg what to do about challenging behaviour.
https://www.youngminds.org.uk/
It also sounds like he might be getting aggressive towards you so you could consult
PEGS UK:
https://www.pegsupport.co.uk/
Your ds is not going to be fully mature for about ten years yet op so I think one of the most important things is for you to work on your own mental health and assertiveness so you can be there for your ds for the long haul.
It’s great you are working on your agoraphobia and anxiety as one of the most important things parents can do for dc is to be good role models and if he sees you overcoming struggles, you will have more credibility and authority with your son when you appeal to him to work on his own future,
A messy bedroom is the least of your worries, your DS needs boundaries and structure:
**getting him occupied in some sort of education and some form of trainee work or hybrid of the two
**tackling the racism; I’d be hauling my son over to the neighbour’s house and getting him to apologise for his language and carry out some outdoor tasks for them, but it doesn’t sound like your ds would be compliant with that
**tackling the porn by changing the wi fi password or limiting access to it, or limiting acccess to a phone itself.
Do you have any good male influences in your extended family op, or male friends who could step in and give your ds some direction? If he is out of the house at all hours and you don’t know where he is or what he is doing, it sounds like he needs much stronger boundaries than you can provide alone.
Op, you sound really concerned for your ds and like you are at the end of your rope. I think one of the most important things you could do for him now is admit that you can’t tackle this by yourself and reach out for support to GP, family services, SS, or any of the organisations listed above.