How Do I Replace Lost Enamel and Whiten my Teeth? (photo)

I have very little enamel, in fact at the age of 19 my dentist told me my teeth where that of a 50 year olds. I don't smoke, don't drink often, I drink tea sporadically, and used to drink lots of coffee but not anymore. My teeth hurt even when I drink room temp water or when air hits them. I'd like to know how I can maybe artificially replace the lost enamel as well as make them as white as possible without damaging any more enamel. I've looked into lumineers and such but want more options.