I don't feel that it would be better for you to end your journey. It would be not the solution of your story. God have made all of us for a certainty reason, and it is his job to decide our life span.
So don't let negatives feeling to conquer on you. Just overcome on all these feelings, choose some goals, engaged yourself in some hobbies.
As you have described that you have to face lots of pain every day, but you should know that there is lots of people in this world who is suffered from deadly incurable deceases and have to face horrible pain everyday but still they have not let their life in the mouth of death.
If you want to end your life without doing any good deeds, your soul certainly will not be able to find any salvation. So, why do you want to be one? Live your life at least for other, for needy and poor people.
You should feel great and your pain will stand less than this great feelings.
Trust me; your remaining life will be more become enjoyable for you.