Hi Lottery, I hope your good health continues, you have been through a lot.
Watching porno is not the worst thing you could be doing. I think many men watch it occasionally. Making a habit of it may not be in your best interest though.
If you feel church will help you then go back. No one needs to know about your interest in porno. And regardless of what anyone has told you God does not judge. Having a belief in a higher power, whether it be God or another power will help give you strength. Try to spend time out of the house by getting involved in other activities, with your church or elsewhere.
Many people start over when they are older then you so don't let your age be a guide for decisions you make.
Like I said get involved in something that interests you. Maybe even take a class at school! Making your days productive will make you feel much better about yourself.
Good luck