Congratulations on gaining the tenacity and determination to make your life more enjoyable and rewarding. If you can hold onto that strength without medications to help, that's great! I hope that your level of self-control stays high and works well for you.
Regarding your comment about depression being all mental, that simply isn't true. It has been scientifically proven that the brain physically changes in depression. Neurotransmitters that connect with feel-good chemical dopamine, are
very low in supply. The result is depression. Anti-depressants boost dopamine levels, which helps us feel better. The trick is finding the right anti-depressant. Working on emotional issues that hold us back helps us feel better yet. Finally, changing our perspective on our illness improves our lives even more.
While I am honestly very happy for you ~ I do want you to understand that we don't have absolute control over our depression. I have become very angry with myself many times for not just letting go of issues following me in life, for not getting better, etc. My body is very resistant to most medications ~ not just anti-depressants either. I've being trying hard in therapy for about 30 years. So, please do remember that devotion to getting better isn't always all that it takes. Otherwise, I would have been over my depression many YEARS ago.
So, if your tenacity doesn't get you through this rough time, please don't keep holding yourself back from trying medication/s and therapy. Very best wishes to you!