Welcome to HealingWell.
I think you have figured this out for yourself. It is a 6 of one and 1/2 dozen of the other whether you stay or go. If you are being supported by your Father and have no job you will be out of school............me, I would tough it out and just ignore the 37 years old stepsister. She must work or go out.
If you don't eat the pork fat offer it to her.
Just my opinion.
Spaceman, I agree with Kitt. You may not like living with your step family but you have a home and a father who obviously cares about you and wants the best for you. How much more school do you have before you finish the program you are in? If it is not that long then I would stick it out because first of all, your dad is paying for your school, your living expenses and when you finish you will have a degree that will enable you to get the job you want. Once you are able to have a good resume and find a job you can think about moving back with your mom. She might expect you to contribute to expenses if you are working but if you had your own apartment you would be paying for everything. I would try to ignore the step sister. That doesn't mean you have to be rude to her but don't let her get to you. And if she complains about a piece of fat on your plate offer it to her and tell her you are not eating it as you are trying to be careful of your health.You may not like your step family but your situation could be so much worse and before long you will be able to do what you want. I hope this has helped.
Spaceman, I understand how you are feeling. But Karen is right. You need to stay where you are and get your education. Can you talk to your dad about your step family? If you give up your education you may have many years down the road where you will say to yourself why didn't I finish my schooling. And you don't know what the living conditions will be like if you move back to your mom's home. You may be expected to pay your share of expenses and without an education you may not be able to find a decent job. You need to think this thru rationally. The economy is terrible which you must know. The people who are getting hired for good jobs have an education and skills to offer an employer. I have a degree and 25 yrs experience as a top manager. I am not working now due to illness this last year and I have a very impressive resume and I can't even get a part time job. I live in a big city and there is nothing out there. Most companies are cutting back their workforce, not hiring. You need to stop worryng about your step famly and take care of you. Just try to ignore them or go to your room to escape them. Ask your dad for advice on getting along with them. He seems to care about you very much. Please don't do anything you are going to regret and not be able to change later. Please post again and let us know how you are.
You have been given advice and options and they have all been given with kindness and caring. We are more then happy to support your decision, but give yourself some time to think this through before you knee jerk and then are sorry later.
How close are you to the family that is living with your Mother.........have you talked to your Mother? You have said your Dad is the one you can count on most.............then ask him for a private date and time where just the 2 of you can talk and no one else is around.........go somewhere with him away from the house.
Being 18 is not easy, I know this but being 63 is not easy either. Please look into counseling, talk this over with your Dad.
I wish you peace and happiness.