I was thinking about your post after I finished writing my previous reply. And another thought occurred to me. You mentioned you're 19. And you wrote about your parents pressuring you into an Islamic marriage. And now you have your boyfriend & the problems you're struggling with related to him as well as your parents. But you didn't write anything about your own aspirations.
I presume, since you're 19, you finished high school. So I wonder if you have any interest in going to college and / or in some other way having a career. Or is your sole interest in becoming some man's wife & perhaps a mother? (These are rhetorical questions... food for thought as they say. You don't need to answer them here.) If being a wife & a mom is your sole interest that's fine. That's your choice. But I do wonder if you've thought about what you want for yourself out of life or if, perhaps due to the way you were raised, you might have assumed becoming a wife & all that goes with that is the only option available to you. Maybe, before you dive into the institution of matrimony at still such a young age, you might want to consider what additional opportunities might be available to you. Again...you don't need to answer these questions here. They're just something for you to think about as you try to decide how to proceed in your life. My best wishes to you.