assuming that your property is being effectively marketed (internet, MLS, good photos, virtual tour, etc..)... 90 days on the market and ZERO showings is a strong indicator in any market.
Realtors are viewing the property on the MLS, consumers are viewing the property on the internet (Realtor.com, trulia, zillow and elsewhere)... and are making a decision "not to come see it in person". They have seen it online, and have made a decision that at your current price, based on what they've seen, it's not worth visiting.
Be objective, go view other homes in your area and near your price range, and see what you're competing with. Have ANY homes in your area and close to your range gone under contract, or closed in that same 90 days? If they have.... what did they offer that you don't? Think like a buyer.
Your Realtor should be able to go over these things with you, and be brutally honest and objective. Good Luck.