Guy gets raised in bomb shelter by parents and they fineally runout off suppules and so they send him to get more stuff but then reaizes that the parents acdently went in to the bomb shellter for a plain crash and while he was out and learning he falls in love so in the end he falls in love with the girl who has been helping him

I think the movie you are looking for is Blast From the Past: Blast from the Past (1999) - IMDb (http://www.imdb.com/title/tt0124298/)