Depression

Does anyone not realize they were depressed until they’re out of it? I swear looking back to when my daughter was born I had PPD. But in the moment it never once crossed my mind. And when I was on my birth control for 4 years I was so depressed but I didn’t realize it until I got it out and realized how much happier I was. Is this normal? I’ve gotten better at realizing I’m depressed. I don’t get sad but I do get hopeless and just feel no emotions. I’m indifferent to everything and everyone around me. But I’m kind of worried that I’ll slip back into depression for a long time and not even realize it until it’s over. It’s like I feel hopeless for so long it just seems normal and it makes me think that’s just how I really am. Anyone else?