The foreskin is not repulsive. Its removal is the mark of the covenant between G-d and the Jewish people. As non-Jews have no obligation to remove it (and in fact perhaps should specifically not do do) and as non-Jews are not inherently repulsive, it stands to reason that neither is the foreskin.
There are deep kabbalistic reasons for the existence of the foreskin and its removal on Jews that are perhaps not appropriate for a public forum. If you are interested in Judaism, your first step should be to talk with your local orthodox rabbi, who will no doubt impress upon you that circumcision is neither the most difficult nor most permanent change made as a result of the conversion process.