What's typical/normal for you won't necessarily be typical/normal for others. My friends have learned that it's quite normal for me to be very affectionate and even tell them that I love them, but they themselves may not be so freely "generous" with their affection. When it comes down to it, I'd say you should focus on the feelings you're having and rather than asking if they're "normal," to instead acknowledge that you have them and decide what you are going to do with them.
I feel like we have something in common in terms of the depression and not being sure if you are unhappy and figuring out why. When I began exploring polyamory, the dark clouds parted little by little, and I realized that I was unhappy because I was trying too hard to fit a mold that wasn't for me. Ever since tossing that mold aside and discovering myself and my wants and needs, I've been a much happier person. There were relapses, don't get me wrong; it was tough. But I'm happier and stronger now for it.