My friend lost a bunch of weight in just a few months.
That is awesome!  I know how hard it is to lose weight.  She  must be so happy.
She is but I'm not. It always takes me forever to lose weight.
I feel you.  That's how my body functions too. Slow weight loss or not at all.  Its also dangerous to lose weight too quickly so don't wish it for yourself too fast.  Slowly and steadily keeps you from getting lose skin or gaining it all back too. 
Yeah you do have a point there. I'm just gonna keep on doing what I'm doing and I'll get to my goal one day.