hockey is a TON of outer and inner thighs.
my buddies who all played had huge legs, and to get them strong they did those "girlie" machines. the ones where the pad is either on the inside, and you squeeze your legs together, or the pad is on the outside, and you open your legs.
plus i remember one of my buddies had this like "slide" thing. it was probably about 5ft long, real slipperly, and had almost like "stopper" things on each end. what you do is where socks, and go back and forth, which mimicks skating.
Plus, you are prob. not getting enough rest.
But shit bro, you're prob. in High school right?
i used to go to school, lift after school, THEN go to the toughest basketball practices in the world (literally) for 2.5hrs.
Granted, i'd be so beat i couldnt even stand up after i showered/ate at night after practice, but you're young bro, and full of test.......