I’ve lost my killers mentality on the hockey rink

Let me explain myself.. I play college hockey and I feel like I’m losing my killers mentality. Let me explain myself.. I am 21 years old and in great shape. I lift 3-4 days a week and am on the ice 3-4 days as well. By far the best shape player on the team. But I am noticing that I am not going out there giving 110% nor am I doing whatever I can to get the puck. I used to plow through a guy, out skate the second and knock the shit out of whomever else was in my way. I don’t feel it anymore. Somewhat like Rocky in RockIII (hate to make the reference, but the Rocky series are my favorite) when Apollo says you lost the "eye of the tiger" I don’t feel like I can do it. When just a few years ago I would be out there giving them hell. I feel like I’m not playing with all heart. I used to play with nothing but heart and over the years it seemed it has slowly evaporated. When I was 18 I was destroying guys on the ice and now (21 yrs old) I’m slowing down. I feel like I’m loosing my killers mentality on the ice and possibly in life too…

In a sense I’m looking for the "eye of the tiger"

Happen to anyone else?