Student or Learner
Most of the time I feel little confused using "its". Could you please, give some specifics examples.
Don't feel too bad about being confused. I believe it's the #1 error made by native speakers when it comes to grammar. Just today someone asked me to read something, and that was the error he had made.
People get confused because you say "Tom's" to mean "belonging to Tom," so why not "it's" to mean "belonging to it" -- but don't think of it that way: Think of its like you would his or hers.