Here is a good thread that I think will help you.
http://www.imdb.com/board/bd0000052/thread/45262870
ETA, will copy main points here in case you aren't a member:
RE: Substitutes for "I" in a story
"If the I is in dialogue, there's no need to remove it, since that's how most of us talk. But you're probably right about needing to reword it if too many I's are popping out at you that aren't in dialogue.
It's a subtlety that's hard to master, but lots of I's probably means you're needlessly filtering everything through that first person narrator. Phrases like I knew, thought, considered, regarded, wondered, noticed, sensed, felt, saw, smelled, heard and phrases like it seemed, appeared, was obvious (to me filter the experience, putting the reader at a greater distance and needlessly adding words. Better is cutting right to what was known or sensed to give the reader a great deal more immediacy.
Since I assume you're writing on a computer, you can use the search function to find every use of those words and remove them--and the I that goes with them.
First Person Internalized--lots of I
I was out on the lake with Jared, and I was getting sunburned really bad. I had a headache from the heat, and Jared's blasting boombox wasn't making it any better.
I smelled something awful. I thought the bait was rotting. So I looked at Jared and I said, "Let's head back."
I knew he was getting mad. "Why? Does the big baby need his mommy?"
I hate it when he does that. I can't help it if I'm younger.
I said, "Because I'm thirsty and you drank all the Kool-Aid."
First Person Externalized--1 I, in dialogue
Out on the lake, the sun burned my pale skin and the heat gave me a headache. Jareds blasting boombox wasnt making it any better.
Something smelled awful. Was the bait rotting? Lets head back.
He was getting mad. Why? Does the big baby need his mommy?
Jerk. Like birth order was something in my control! Because Im thirsty and you drank all the Kool-Aid.
Notice that I dumped several I's by getting rid of I said. You can usually do that without confusing the reader if you have the character's actions or thoughts (and nobody else's) in the same paragraph as the words he says. But most of the Is were filtering what was happening through the narrator's experience."