i know it appears rather hopeless right now, but you do have some things in your favor:
1. you have identified that you have had enough. that's half the battle.
2. you are young.
3. you are educated.
4. you have no children with this man.
5. you do not have shared property.
6. you are not married.
perhaps try not to look at leaving as a permanent thing. it's ok to just need a break to collect your thoughts and sort your feelings.