Don't feel bad. I had a 94 base model 5 spd that only had 36,000 miles on it, and was in showroom condition. This was in 1997. It took me 6 months. I found a buyer that gave me full price. Most people are looking for a deal. You might try and have someone neutral read the ad and see what they think. It may be something either you need to reword, leave out, or add.

My ad read something like this:

1994 Base model 5 spd in excellent condition, black, air conditioning, power windows, 36,000 miles, $19,000 OBO.