what if he's the one...?

What does it mean if you are just starting to date someone and you think, "what if he's the one?" but not in an excited, "I think he's the one" kinda way, but  more of a "crap! what if he's the one? What if we start dating seriously and I can't find any red flags....?  what if we get along and he wants to marry me...? what if I end up marrying him? maybe I should end it now before it's too late" kinda way.

Let's take a little stroll in my brain and analyze for a moment, shall we!? because it is my most favorite past time, of all time! hehehe

Does this mean I don't really want to be in a relationship? Does this mean I'm not ready for a relationship?
Am I afraid of commitment? Am I messed up?
Am I still hurt and haven't fully let go of the past?
Do I just not like him enough? Am I too picky? Will I ever like someone enough to want to marry them?
What if it means that I won't ever be happy with who I'm dating?
Will I always wonder if there is someone else out there for me?
Does it mean that I am subconsciously being too picky and not allowing myself to like anyone?
 Will I ever date someone I feel right about marrying?
And if I do ever feel right about marrying someone again, will he want to marry me back?
(that is the one question that keeps me up at night, so to speak...)