Well said Krow. There is absolutely NOTHING wrong with being a virgin- Hell, there is nothing wrong with waiting until marriage. You will be free of disease, never have an illegitimate kid and all the "baggage" that goes along with sleeping with a girl (unless you just get a prostitute) will be no problem because there will be none.
Girls get weird after you sleep with them. Honestly. If you are dating a girl and you think she is cool and you guys are doing great, just sleep with her a few times- she will change. Trust me.