Hello, I'm sorry if this is a bit disrespectful to those of you who are actually depressed and know it. I'm 17 years old and I'm wondering if this is a type of depression, since I don't know exactly what it means. 

Generally, is it possible to be depressed but not feel sad? 

I mean, I felt nothing, and I did nothing in my life, but I was never sad so I didn't think I might be depressed. 

To describe, all these years I had been "dull", I hadn't felt happiness not even once, I was lonely and basically disliked everyone, and my life was empty. But still didn't realize it may be depression. I thought my life was normal even though every emotion I (rarely) felt was negative, and my way of thinking was negative.

What do you think?