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I think that everyone has value, even the worst criminal you can think of. They are choosing wrong behaviors but there is still value inside of them somewhere. This is probably where their path forked off down the wrong road. They were never respected/valued so they don't respect or value themselves or anyone else. They might find rehabilitation if they could find their own value?
I even think a lot of inanimate objects have value. I am a big environmentalist and believe that we have to take care of the earth and I cannot throw anything away if I can find someone else who could use it. I think that valuing things and being thankful are very intertwined and are spiritual things. In my opinion finding value in everything gives meaning to life. Just think of someone who doesn't value themselves, others or things. Where do they find meaning in life?
My life has purpose because there are many things that I am very passionate about and extremely thirsty for knowledge and understanding about. There are so many things in life which are so darn fascinating.
I used to have less self-worth than I have now. This stuff comes from somewhere. Have you thought about where yours came from?