Depression.

Let me tell you a few things about depression:

Depression is a vampire. It drains you of all your positive feelings.

Depression is unexpected. It can come to you when you think you’re happy, having the best time of your life.

Depression is a rapist. It forces itself into you and you have no control over when it will be satisfied by your pain enough and stop.

Depression is darkness. It’s the tunnel that has no end, no hope of light.

Depression is that monster that lurks in the shadows of your soul and waits patiently until it feels there are enough shadows for it to make a move on you.

Depression is a thief. It steals your friends, your lovers, your family, your job, your education and anything/anyone you hold dear or important.

Depression is a state, it’s a condition. It’s not a feeling, but it consists of many feelings like: agony, pain, sadness, feeling as a failure, feeling suicidal etc.

Depression is an eternal battle. It’s not curable. You have to learn to live with it. You have to embrace the fact that you’re always going to suffer from it, and try to learn how to manage it.

It’s really important to talk about depression. Bottling up your feelings and going through depression on your own is extremely hard on yourself.
Ask for help. Talk to a friend, family member, stranger on the street/internet, therapist, counselor, support group...

Because always remember:
Sharing and asking for help are depression’s worst enemies. 
When you face depression with the assistance of others, its strength and control towards you reduces.

ps. Many times being suicidal doesn’t mean you necessarily want to commit suicide. It means you just can’t take all this pain and negative feelings anymore. So don’t try to end your life! There are free services that are there to help you!
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Do you need help? (some useful links):
-http://www.befrienders.org/
-http://www.suicide.org/international-suicide-hotlines.html
-http://www.samaritans.org/
-http://www.depressionalliance.org/information/useful-contacts
-http://www.swlstg-tr.nhs.uk/advice-support/for_service_users/telephone_helplines/