Not sure if I'm depressed

Does anyone feel like it's hard to know if you're depressed? I mean where does "feeling sorry for yourself" end and "depression" begin? What if I'm just really lazy?

I feel like it's really difficult to have perspective on this, it's almost like I have to try looking outside of myself.

I know I should see somebody but in a way doing that would make it seem more real.

The thing is I've been "not sure if I'm depressed" for about 2-3 years now.