I rode six months trying to get used to a saddle that didn't fit me. Your body does not adapt to a saddle that doesn't fit, no matter how hard you try. It is worth the money to invest in a saddle that your sit bones sit on. Now I can ride 100 miles on my saddle. When I swapped bikes I kept the saddle. It is nothing special as far as saddles go - it's a stock saddle from a Specialized Dolce. But it fits me perfectly.

If you are getting sores or blisters, I would recommend shopping for a new saddle.