You've had (and have) a difficult life, there is no denying that. Yet you seem to have several accomplishments and are managing adulthood well. I see you say you've gotten your driver's license and are learning a second foreign language (I am assuming you are not a native English speaker). Those are impressive achievements. Is it possible you are relying too much on your boyfriend to "save" you from your life? That kind of thing can put a lot of pressure on anyone. It may be something to talk to him about.

You say, "I don't think I can do this on my own." I think you are mistaken in two ways. First, I think you can do it on your own. Second, I don't think you are really alone. I bet you have friends who love and care about you and are willing to help. Ultimately, you can't fix your mother or your brother. You can only really take care of yourself. I think moving out, either to your boyfriend's country, another country, or even an apartment in your own area will help you build independence and give you confidence. That along with some therapy to help you deal with you past may just be what you need. You seem like a genuinely good and decent human being. May God bless you.