Hi Nyanpasuu,
I just read your post and I found nothing stupid about it, so let's set that comment aside. I am truly sorry for the way you feel about your present life and circumstances. Your fear and anxiety and circumstances are overwhelming your mind, making it impossible to think for yourself what is in your best interests.
Your lofty, farther away, goal is to leave your country, but you must finish school to do that, right? You have said as much. Why don't you right now begin to prepare your school schedule, a small goal, but one you have done before and one you can complete, within a deadline, correct? That could be your first goal, and it will be an accomplishment for you, and maybe set you up for the next goal, which could be to return to school
You describe yourself as a NEET (I had to look that up), but since it means a person who is unemployed and not in school/training, you have the opportunity to change things and that kind of self-loathing description will no longer apply to you if you take the next step, and get back in school. Remember your larger goal is to be able to move from your country, and you need the school to do that. So why not get started again? Then set a goal of making it through a semester at a time, and begin to plan and visualize in your mind what your post-uni life could be like. Research and plot where you will go, how you will get there, what do you need to accomplish those goals. Taking and performing these steps will force you a bit out of your head, and focus on something outside your mind and will direct you to life-changing circumstances, that you can't even imagine right now.. Taking action and forcing yourself to get going is a great way to relieve anxiety.
I know all of this is extremely difficult, but you can do it, you were already in school before. And another favorable result is in the time it takes you to finish and plan the next chapter of your life, you will be able to assuage your mom's concerns and she will improve as she sees you take steps, one at a time, to move out of despair and into an organized life of accomplishments, and I know you want her to feel that way.
Good night, and please keep us up to date on your life and your concerns.