Is it normal to not feel emotions sometimes as a teenager? Sometimes I think that if people asked me how I feel, I wouldn't be able to come up with anything, not even just not knowing how I feel. I used to be better at this whe I was younger. I am 16y old female in high school.

The teens are a hard time to define emotionally.  Sometimes you have too many feelings and others you just feel numb. It is perfectly normal, as long as you don't "set up shop" in the numb feelings. When you are feeling that way and it drags on a bit, go do something you enjoy.