No, your mistake is in thinking that anyone is born with any of these personality disorders. While there are certain genetic traits that can make people more susceptible to developing a disorder - it isn't fate. Past experiences, upbringing, traumas, etc., especially in childhood and early life, can influence anyone into developing a disorder. If you're trying to understand your self better, focus on your self as you are now, and which of these criteria you match up with (if any) while distinguishing from the others; only after that should you look to the past.
If you were schizoid and looked at the schizoid profile, you would probably match, to at least some degree, with items on the list the higher it is, but find there are too many items on the avoidant profile high on the list that don't match you at all.
If you were avoidant you would have several traits of the schizoid, but would experience the social anxiety and stress, fear of rejection, feeling inferior, etc. that a schizoid would not.
Keep in mind that with this view of it all being on a spectrum of schizophrenia, that there is going to be a bit of overlap.
If you've concluded that there are too many matches with one of the profiles for you to ignore, and there are too many things missing or wrong with the other profiles, then you can start trying to figure out the past to understand how/why you are the way you are.