I have good technique but i don't know how to apply it in sparring

Some guys in my gym have the most weakest technolique and they manage to spar well and lands shots, even my coach tell me that i improved much on my technique, when i spar i don't know if its fear or something, but when im punching o kicking, i am afraid to have a counter, so i just freeze and keep defending and cercling arround my sparring partners, i really don't know how to fix this. If any one has any advice.