All humans have worth in the sense that what we all do as individuals affects others like a ripple effect even when we do not personally see or feel those positive results. I like to learn everyone's name wherever I frequent. I learned almost all the names of the people I deal with around town. One consistently grumpy woman was just not warming to me in anyway and I got her name. Now I am able to greet her by name at the register or in the store. The other day she smiled at me! I was shocked. I didn't assume she hated me, or anyone. But maybe my consistent friendliness made her feel something worthwhile in the long run. I could have gotten annoyed or indignant over her attitude over these months but I kept trying. We do affect each other and we may not ever be privy to the ways we affect one another. I cant prove your worth because its subjective and intangible. But I guarantee its there.