1. Talk to someone. If not family, someone. Don't be afraid to talk to someone professional and to demand it.
It's nearly 20 years since I did and it was honestly life changing. It just got me to look at stuff in a different way. I don't know how you feel now but I sat in my back yard and sobbed and sobbed. I didn't want to live, just for a short while. I've never felt that before or since but I'd drunk two bottle of wine and I honestly thought about doing myself in.
I didn't (obviously) and the ability to talk to someone without judgement was incredible as I felt like anyone I spoke to, I was just bringing down.
So talk, make a phone call or get on to GP and DEMAND you get seen by counselling or whatever.
2. Don't even think it would be better without you. It wouldn't. People love you. I lost an uncle and my cousin lost his dad. I am still haunted by my cousin's face on the morning we found out.
3. If you look for some help, talk to someone, try meds, whatever it is, it might help you talk to your family as you can say 'i feel this way, but I've done this...'
4. One step at a time. One little positive thing, however small. Each day, set yourself one tiny goal, however little.
5. Keep talking to us if there's no one else.