Please be helpful. Basically, in sparring, I'm pretty shit. I'm 6-2 in actual fights and have beaten a ranked guy pretty handily so I know I'm not terrible, but in sparring I just can't do it.
I dunno what it is. It's like I don't want to reach for my shots, like I'm just throwing my punches half heartedly in fear of getting caught. Just today in sparring I was up against this lad well bigger than me and he just fucked me up, throwing full power punches on me, a guy a good 15kgs heavier than me. I end up falling apart, losing balance and confidence and just can't spar properly.

And I've been at this for a good four years now, I've just been dreadful in sparring lately.
Any tips? I know it's difficult without actual footage but I dunno how I'd get any clips.