Hi, I can't diagnose you because i am not a doctor but, because you are feeling like this, it is very important you see a doctor and get some treatment, so you don't feel sad and suicidal. Maybe if you could see a GP or local doctor instead as i think they are cheaper than a Psychiatrist. If you do get more suicidal and have a plan i really urge you to go to your local ER, and tell someone how you are feeling. You are young and shouldn't be feeling like this, so i hope you can see a doctor or councilor to help you.
Hope you feel better soon
Freddie
Recently on Sunday I got very angry because my Father and a few of my used to be good friends forgot all about my birthday. And my mom who used to buy me birthday cake did not do so. I got so upset..and I felt so unimportant to them. I've ignored them for days and I am feeling suicidal. Yet, they are nonchalant about it which upsets me more