No it isn't unrealistic at all and yes it is possible to find a man who is willing to refrain from sex until he is married. I know so because I am. Finding a man who will refrain is difficult yes, but doing the right thing usually is. Just don't look for a man at clubs, bars, or parties because you probably will not find a man who is willing to wait at those types of places. lets face it, most people lose their virginity as soon as possible, but most people also regret it. There are a million social, physical and mental health, and religious reasons to preserve yourself until marriage.
No man you marry will be disappointed when you tell him you loved him enough before you ever even met him to have saved yourself for him. You have my respect and congratulations if you choose to be a virgin until you are married and hold out for a man who loves you enough to do the same.