Hey,
I hope you have found it somewhat useful to read through the forums, sometimes it can be reassuring knowing that you are not alone in what you are experiencing. It sounds like it has brought some things up for you though in relation to past trauma - I hope that this has not made things feel worse for you. Please do not hesitate to call one of the helplines here: (https://www.beyondblue.org.au/get-support/national-help-lines-and-websites) if you are wanting more immediate support.
I know what you are saying when you feel that you are a burden. I have struggled with this myself. I understand everyone's experience is different, and I cannot imagine what you are going through right now, but please know that your family has stuck by you because you matter a lot to them, it sounds like you have many people that care for you. You are not putting your issues on them, that is what family is for, they are there to support you, you are not a burden to them. You are not a burden for needing their help, you have obviously been through a lot, the people that care for us are usually happy to help but they sometimes don't know how if we don't let them in. I am really sorry that your friendship broke down, it can be so difficult trying to not let your mental health put a strain on relationships.
Have you ever seen a psychologist/ mental health clinician? If you haven't, would you consider it?
Take care, and as always, please do not hesitate to talk more if or when you feel up to it.