They Don't know what I'm hiding and the battle I'm fighting within myself

I feel Alone Like No one cares for me, I only have two friends that rarely listen and Man I feel so freaking alone and I don't know why I have to be strong for everyone. I can't tell my mom or my family because I have to be strong for them in the situation we are in and I can't talk to the only friends I have because one is just really caught up in her life doing school, work, dating and I get that so I don't try to interfere I just try to be encouraging and happy for her. My other friend is going through stuff and depending on me to help her and encourage her as I am but man I feel so alone and I just feel the desire of life slipping away. I have this constant sadness I try to get rid of, I try to encourage myself, go out and do something new but nothing. Nothing takes away the deep loneliness of feeling misunderstood and forgotten and it hurts, it hurts so bad I just wish someone knew and would tell me that they understand what I'm feeling because what I am feeling I would never wish anyone ever feels this way because it makes you feel so dead inside so abandoned it's almost as if you weren't alive.