To feel this way about someone i hardly know

I've never felt much interest in most people and I'm 19. this means I have never wanted a bf or gf or even had a real friend, so I spend most of my time online. I happened to meet someone in an online game(please don't judge based on this) and I can't stop thinking about him since we met. I barely know him - never seen what he looks like or heard his voice, don't know his name, etc - all I know is that I love his personality and sense of humor, we have a lot of the same unusual interests, and he's not pushy or overly nice to the point of being fake like most guys I've known. I know what city he lives in and coincidentally my family is moving near there next summer. I would like to meet him but the problem is that I am so afraid to learn more about him because I just know there will be some exception that we can never be happy together, and I will have to wait another 20 years to find a guy this great... I couldn't stop crying at the thought of this all day, I am even afraid to go online because we will run out of things to talk about or I will say/do something wrong and make him leave as all my past ''friends'' have, but I am longing for him all the time that we are away.

Sorry if it was lame but please help... I have never felt like this for anyone in my life so I don't know what I'm supposed to do...