Earthbound

Joe wants the ordinary things in life; a job he doesn't hate; a place to call home and nice girl to settle down with. He's just like the rest of us. But this is also the story of a young man who was told by his father, on his death bed, that he is an alien and must continue his dying species. Joe wins the heart of a 'compatible' human mate. He falls in love with Maria but once he tells her the truth she thinks he's crazy. And the more he tries to convince her, the closer he gets to losing her (earthboundmovie.net)