Like everyone else is saying, without seeing a decent sized sample of your writing it's hard to address specifically. (But you're nearing the 50 posts required, so keep at it and you'll be there soon enough.)
One thing some writers do that adds pronouns needlessly is filtering, where the author tells the reader which of the senses the character used to gain information, or that s/he used the brain to reach conclusions, find correlations, etc. In good writing, the author trusts the reader to figure out a character knows there was a sound because she heard it, rather than telling the reader she heard it.
Instead of the author sharing the means by which the character experienced whatever she did, the author can cut directly to the experience, making it the subject of the sentence rather than the character (or a representative pronoun) being the subject. He heard the truck backfire becomes The truck backfired.
If the author filters everything through the point of view character, it creates psychic distance between what the character experiences and the reader. The sense of immediacy, of the reader feeling as if he's right there, is diminished, so getting rid of it benefits you more than simply losing a bunch of pronouns.
Filtering can usually be spotted by the words that do it, although not all uses of these words are filtering. Search for knew, thought, considered, regarded, wondered, noticed, was aware, sensed, felt, saw, hoped, realized, smelled, heard and it seemed, looked like, appeared, was obvious/apparent. Decide on a case-by-case basis whether it's there to filter the point-of-view character's experience, and if it is, rewrite it.
Maryn, who used to filter ridiculously much