I believe I'm in a similar boat as you. I suspect the difference is of degree.
As for what to call it? I consider myself a fairly melancholy, introspective sort of person. That's what I call it.
Edit: a quick Google reveals "melancholy" is specifically tied to depression! Maybe I am depressed after all. But anyway, I usually use the word to mean the absence of vitality and vigor, rather than the presence of depression. Closer to "pensive" than "depressed".
As for what to call it? I consider myself a fairly melancholy, introspective sort of person. That's what I call it.
Edit: a quick Google reveals "melancholy" is specifically tied to depression! Maybe I am depressed after all. But anyway, I usually use the word to mean the absence of vitality and vigor, rather than the presence of depression. Closer to "pensive" than "depressed".