I'm sorry about the years you lost and the years you missed. I also lost many things in almost all ages I went through... I never had a relationship, I never kissed someone, what I think is very depressive. But your life is still waiting for you. I deny my age, I'm a little younger, but I feel as I never got 18. I still feel like a teenager, and my life, what I do with it, is wasting time.
Denying depression is bad, I would ask "Depression: how do you know you accept you have it?"...
It's good that you are now fighting for your life and starting to know happiness. Getting out of depression is a process, some people stick with it a lifetime, others just need to fix some life problems and everything is ok by then. But it take its time.
Not from my experience, but talking about the experience from a person I know: you start to treat it and you feel you're much better, but at every glance to the past, you realize that you are even better...so when a person think that he got is life back, perhaps is still much more to get, and more space to improve.
Best wishes.