I see you're very young. First of all, please don't make any drastic decisions as a first option, or you'll find yourself in a vicious cycle of self-destruction. Don't harm yourself or fall into bad habits.
I think the hardest thing in life is loving yourself. When you achieve that, you no longer depend on the validation or affection of others.
Focus on yourself. You still have to discover yourself; your adult life and facing the real world are just beginning. Now, you create your own path. Forget about everyone else and think about yourself, your situation, and what you would like to do.
You are important and capable, take it slow, think calmly, and don't despair. A "perfect life", being loved by everyone and without problems, does not exist. It's all just appearances (generated and influenced by the media), don't fool yourself.
Don't do things to please others; never lose sight of who you are. Set achievable goals to start with, compete against yourself. You can't compare yourself to others because their lives and opportunities are different from yours, and it will only lead to frustration.
You haven't done anything wrong, and it's not your fault if others don't care about you. Society today is quite cold and lacks empathy. Most people seem like soulless or pre-programmed robots.
Don't let yourself be consumed by dark emotions or thoughts, CTB should never be your first option.
Perhaps you could visit the "Recovery" subforum. It's a more positive place, and the users are doing their best to get through this.