u/Impressive_Apple_694

I’m 14, 6'5", and just started boxing. On my second class, I sparred in an adult class where everyone had about 50 pounds on me. My coach had me spar a 5'7" pro, and I got beat the shit out of. He told me to use a long guard, but I kept missing jabs. I landed a few, but mostly missed to the head, while still keeping him at distance. Is this good technique, or am I just wasting energy?