The search for meaning

On my good days I strive toward what I understand to be the Good, and on my my bad days, I struggle merely to survive and wonder why the hell I'm bothering. If there's some ultimate purpose or meaning to life, no one has so far informed me of it. I see us as all in the same predicament. We are here briefly and we each have our own sorrows and joys. Too often, life brings us sorrow rather than joy. If I can look around and feel that some other human being's life has been touched by the good because of my existance, that's enough for me to keep soldiering on. If I ever reach the point where I feel that my being here has become a negative and I see no way that this will change, then I'll probably throw in my towel.