Is it normal to want to move away alone?

I sometimes think of gathering my savings, transferring to another location of the company I work for, renting an apartment, and living alone far away where the cost of living is cheaper.

Reasons why: My parents had me cosign for a house and they didn't sell the house by the time my brother graduated like they said they would. I'm more than willing to cut my losses and remove myself from the title and mortgage, but they're making it complicated. When I get out of this, the next house I get will be in my name alone.

My boyfriend's sister always claims to be too depressed to work. Her parents pay for her car, credit, and a whole bunch of other shit and she acts spoiled when they can't. She always dates people that are just like her. Since my boyfriend is depressed and probably won't be able to take care of his sister or her significant other, she'll probably turn to me for a place to live. I refuse to enable her.

My sister always complains about being poor and a mother. She gets pissy when I don't pick up certain groceries for her. She's poor, but she's a privileged poor. She lives with her rich in law's in a multimillion dollar area who are always more than willing to spoil her and my nephew.

My brother can't manage his finances. His credit score is 422 and he keeps nagging me to cosign some car loan because mine is 814. I make half of what he does and unlike him, I can save money, manage my bills, and I don't go into credit card debt buying frivolous stuff.

Are my reasons for wanting to move nnormal?