Hi, Littlebear, and welcome to the forum!
I can remember feeling much as you describe, after graduating from college and moving back home. I missed my old life, my friend, the creative atmosphere, the freedom. I had to find a job, had no romantic prospects, and felt restricted being in the family home.
Because you are feeling all of this, please do not settle for a substandard relationship with someone who treated you badly, just because he is part of your history from your happy times in school, etc.
My advice is to pace yourself, give yourself some time to get established in your new job, find a place of your own, and make new friends. 27 is not old, sweetie!!!
Seeker