Welcome to the forums and thank you for sharing. I feel like the first thing I want to say is that you are definitely not alone. When it feels like our own lives are falling apart, it can be easy to look at everyone else and assume that they have it all together. Not only is this definitely not true, but you don't need to compare your life to happiness to anyone else.
I'm sorry that you feel like your chance at a 'new beginning' didn't go the way you planned. Personally I have never found this mentality to work for me, so don't be too hard on yourself. I have made a lot of progress in many aspects of my life over time but it was achingly slow and hard to notice at first. But progress is progress. Give it some time and I'm sure you'll start to see signs of the change you're hoping for.
This is probably a bit cliche and something you've heard before but it got me through sometimes so I'll say it anyway: there will be people that don't like you no matter what you do. Some people are just negative or horrible for no reason and I'm so sorry that you've had so many negative people in your life but it's not your fault. And who's to say you aren't destined for something great?
I know it's much easier said than done, and it took me a long time, but one of my favourite feelings are the days when I muster up the courage to decide that, for a while, I just won't care what people think. I'll never make everyone happy so I may as well be happy. Also this one is a bit strange but it works for me; listen to a song that makes you feel really confident while you're walking somewhere or around the house. Music makes a huge difference to my mood.
Maybe you can try making little changes to your normal routine to make you feel more in control. Try a new hobby, text someone, sit in a cafe or park instead of at home, even just go for a walk. Something that breaks up the monotony until you can find something that you feel like you can carry on with and incorporate into your routine.
This turned out kinda long but I hope some of it is helpful. I have faith in you and I hope that you can find something to help you feel happier and more in control. Feel free to come back to the forums whenever you need and let us know how you're getting on.
All the best