it comes with time. there are some things you can do though:
1. pick one thing to work on for a certain night, and repetitively work it while you are sparring. For example, if you want to work sidestepping, make sure you side step alot while sparring. you will get hit, but A)that will get you accustomed to taking hits and B)practice makes perfect.
2. watch your opponent's body. I'm not saying focus on a certain area, but to be mindful of what his body is moving. his intention can be easily conveyed by the movements he makes as he is beginning to strike.
3. don't get in the habit of always moving backwards. you opponent will apply forward pressure, and he can move forward faster than you can move backward. you will eat punches, and lose your balance. If you do move backwards, you may want to step offline, so that you are not moving back in a straight line.
i'm nobody...i'm nobody. i'm a tramp, a bum, a hobo... a boxcar and a jug of wine... but i'm a straight razor if you get to close to me.
-Charles Manson
I will punch, kick, choke, throw or joint manipulate any nationality equally without predjudice.
- Shonie Carter