No, you don't have to lie. It's okay to not be into small talk and all that comes with a dead conversation. What if the two of you become friends, the whole friendship on your part will be a big, disappointing, depressing LIE! Just be yourself, whatever that is, and get your haircut because most of the time once you pay its on to the next customer for the stylist , barber, etc... and just like you they wonder what their gonna do that evening or how they are gonna pay that big car payment, you know. Oh yea, I used to be a barber, just go enjoy your haircut it can be very stress relieving.