Get a mic that has a foam pad around it. Have you ever wondered why the mics the stars use have a foam pad around them?
Your going to have to practice saying certain words and letters so they do not impact the recording.
Slow down, take your time when recording.
Record in segments, then slice them together. If you have a bad segment, you can rerecord just that segment.
You need to figure out what letters have a negative impact on the recording, and teach yourself another way to say those letters. For myself, its the letter "P" - it sounds more like a "pop" then a "p".
Try increasing the distance between you and the mic. Instead of using a headset and the mic being 2 inches from your mouth, hold the mic out 1 foot from your mouth.