..."But what defined me before, I guess, was just surviving, and now that surviving is second nature I feel lost. I'd appreciate any advice, maybe it's just growing pains now that I'm able to live and grow."....

You hit the nail on the head here. That is why depression is a feeling that likes to be re-enforced. It is all related to survival. A Vision Quest would help now. Learn about who you are bu doing things you like doing. Making Art is a good way to learn about yourself. Meditation can also help.