How do you get it off your chest

Went gym with alwyn today, and the instructor there told us abt how we were doing it wrongly for Bench Press, and have screwed up our shoulders. Pretty scary thing really, since i've been gymming for more than a year, thats hell lot of time put not only to waste, but to damaging ur own body!

bothered me hell lot. Spents plenty of time today researching what to do abt it, by digging up MH and searching the net. Now my work schedule's screwed, and i dun have a definite answer. this doesn't sound good. Alright, night time then sleep and everything 'll be better someday sometime.