i can play quite well without it, but i never seem to be able to use my pinky to play guitar. its always just three fingers. i can still play alot of shred and thrash stuff, but i really want to improve and use all the fingers. any tips? ive been playin for about a year
No tips, just use it. It will come with use. You have to build strength. It's really beneficial to use all of your fingers.
Kirk Hammett said in an interview for Guitar World I think it was, "Are you going to let your pinky just hang there or are you going to use it?" He originally thought that to himself, but you get the idea. Make it a habbit to use it.
A good place to start is with scales. Also try using three finger power chords.