Well, I learned to enjoy that soreness. I looked at it like a sign that I was getting stronger. Do you have a way to measure your progress? I find that can be inspiring--to see that a month ago I could only chest press 35 lbs., and now I'm up to 50 lbs. makes me feel like I've accomplished something. Working with a trainer can be motivating, too, so you might try that.
Women who behave rarely make history.