I'm so sorry you're going through this

I was the same way at 14. I used to self harm often and have the same thoughts. My best friend did the same to me! I ended up switching schools. At first I hated it but my youth pastor noticed me and began talking to and helping me. Then his family got involved. I never thought anyone would notice me like that.
Finding someone to talk to -a youth pastor, parent, teacher, therapist- is a huge help.
I know personally, the future changes. I'm 24 now and at 14 I didn't really think I'd get any better. I know it's painful but just remember that things change. Things get better.
You have so much ahead of you and you never know, the future could be great. You'll meet a lot of cool people along the way. Just hang in there!
Try focusing on something you enjoy. I was into art, theatre, which was and still is, calming and distracting.
Just know that you're not alone!