I post quite a lot on here and time and time again I find myself saying the same kind of things because people struggle with the same kind of issues. Most of them are related to the unnecessary shame that many posters feel about what they are going through. Here's a few - feel free to add:
Self harming is a coping mechanism - it's not a crime, it's not 'bad' and it's nothing to be ashamed of
They will miss you if you kill yourself, they are not better off without you, that's your pain and illness lying to you
Suicide is not your only option - tell your doctor/cpn/psychiatrist exactly hwo you feel and don't put a brave face on. Save that for the outside world.
Suicide is a permanent solution to a temporary problem
Anti-depressants are not addictive, even though you need to come off them slowly.
You are not 'odd' or strange - many have felt like you - speak out and you will find out.