Is it wrong to find vagina's disgusting?

no it is perfectly acceptable to find them unattractive and in your case disgusting. Many people feel self conscious about them as well and are scared for a man to see them. Men may also find them disgusting as they just look like a lot of saggy skin between the woman's legs. So in answer to your question, no it is fine to think that. You are one in many that feel this way.