Haircut-shall i cut it?

Hey I'm 16 and my hair is prettyyy long!
It goes up to 1.5 inches below my rib cage. I've never had short hair, I've had my hair this length all my life.
My I'm getting a haircut and I'm contemplating whether I should get a trim (2.5 inches off) or if I should cut it to end of bra strap length. I don't know what to do because I don't wanna regret anything because it will take aaggeess to grow back and it might make me look bad, but, it may it may look nice! Ahh I can't decide, please help :)
Ps, how much will I bw cutting off of I got it cut?
 
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