I think you need to talk to your mum about how you are feeling, not just about this new man in her life but about everything. The fact that he is turning your life upside down and making so many changes you aren't happy with you have to make them known because you can't live like this. You mum might just think nothing is wrong as long as she is happy but maybe she needs someone with an outside look on her relationship to talk to her about things. I know it's not the easiest things telling your parents maybe they aren't doing what is best for them however it needs to be done.
About education is there anyway you can re-do the year or maybe try a different course where you feel passionate about what you are doing as this will make you work a lot harder to get to where you want to be.
It's a shame you can't go live with your dad because of not being able to get GED if you don't however maybe in the long run it could be better for you as you sound like you don't enjoy living with your mum. You have to think about things and talk to your mum. Good luck as it might be difficult but once you have said what needs to be said you will feel so much better.
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