What are some tips for sparring Karate shotokan?

[HikariHonto]

Im 15 girl i started karate like in june or july? im a yellow belt now and i SUCK at sparring i can't do anything and its just really aannoying!! I dont know whybut i just cant do it. I mean sometimes i don't mind but then today i had to spar with this guy and he just ruthlessly punched me in the chest and it just really frustrates me !!! that i cant do anything all i can do it like the katas and the stuff that doesnt involve sparring...should i just quit or keep at it?

 

[tiktak]

the secret is letting your opponent come to you then counter punch