Is a life that takes from society without contributing worth living?

I think you show promise. Stick with it, but try not to let the guilt and anxiety drain all the pleasure out of life. Enjoy life, and people will be happy they helped you out when you need it, because they know that when someone finds a little happiness, they naturally turn those bits of pleasure into a future worth living. Those who never let themselves feel happy will not build a happy world to share. So I encourage you to try to be happy, even if only for my own personal selfish sake, to help convince me the world will not be taken over by sad fools who are too scared of a little social failure and strife to ever learn how to enjoy life...