I'm glad to hear you got your own "tenancy." I take that to mean you have your own flat. If that's the case, you are off to a great start. You need to become more and more autonomous. Don't let yourself be a person who needs to be rescued. Rescue yourself.

I'm sure all kinds of negative influences weighed on your brother and you. As children, we are dependent on our parents. However they want to treat us, we have to suck it up. But you're grown up. Don't spend a lot of time dwelling on your unfortunate past. You've got better things to do with your time.

No more waiting for others to "let" you do as you wish. Live alone. Keep living alone for a good while. Get used to running your own show. Sounds like you have now a chance to be more "autonomous," more in control of the environment you exist in. Walk away from drama created by others. You never signed a contract to keep starring in their show.