My parents are threatening my relationship by butting in?

i am 22 and i moved in with my bf for the summer. I plan on moving back home at the end of august. I live with my parents as i am still in school and can not afford a flat on my own. My bf lives far far from me and I was offered a job by where he lives. I had been visiting him when I got the job offer. I decided to go for it and moved in. It was to be a temporary job. I informed my parents and they were happy. my job has since fell through and I am not unemployed, still living with the bf. I decided I would just stay for the summer since I already had made arrangements. My parents are furious and will not stop telling me to come home and how they dont approve. Mostly because we arent engaged. I feel like they are putting unnecessary pressure on our relationship and they need to back off. Ive told them we are discussing it however we dont want to rush into anything unprepared. I still need to finish school first and we would like to be more financially stable before we get married. My parents dont seem to understand this and see an engagement as the only answer. I see this as foolish. We are making steps towards that direction, what difference does a ring make?I am an adult and feel its isnt up to them but up to me. How can i get them to let go and let me do my own thing.