The thing about depression and self-harm, it's a vicious cycle of feeling a sense of defeat over and over again about things that matter to you and often feeling like attaining the goals you set for yourself is highly difficult, if not impossible.
This is just food for thought.
Is school/studying something you enjoy or does it feel like a job you dislike or even hate? There is research from Harvard that shows there are differing types of intelligence with school smarts being just one of 8; yes 8 different types. You probably are gifted, but school may not be the right place for your brilliance to flourish
Do you have friends and loved ones you can talk to about troubles and hardship? It's wonderful your Mom is so supportive, are there others that you can also be vulnerable to? Having people you can be your real self to and accept and support you can make a huge difference in our mental well being (especially for extroverts who require positive interactions to maintain their ideal mental state), especially considering where you live makes finding a signficant other that suits your preferences a real challenge
Finally, is what you are studying what you aspire to do? Being forced to learn or work in a field you don't care for creates a sense of crisis in many people (in fact the term is called quarterlife or midlife crisis, referring to times people tend to experience this problem in their life)
