I have 2 bumps behind my left ear small sized, and a kind of bigger one, behind my left ear as well.

The bigger one hurts a little when I touch it.
The smaller ones don't.
Could it be a swollen lymph node?

Finally, should I go see my doctor?
I'm 20, and female if that helps

I have small bump also behind my left ear.

You probably should go to the doctor.