Greetings,
Exposure and vulnerability for 'PTSD people' will always be that much harder for our personal boundaries may be nonexistent, in tatters, undergoing repair, or being established first-time from scratch. A person on the street might be tempted to minimize what would or could be strictly unique here as 'most everyone feels anxious', and such is true - to a point. The fact of the matter is that our templates of relation often aren't the best, while being a mindful as possible to protect ourselves has to be dialed down towards an 'exposure setting' if any connection is to be made.
If one dated infrequently in the past or married in haste to a partner not quite worthy of the description, self acceptance consistent with knowing that one's actual age contrasted to what maturity and experience can bring to bear upon matters may not strictly match. Across the gifted literature, writers speak of what is termed 'asymmetrical development' where precocious interests are taken up by a child that to some might telegraph preternatural maturity, although absent quality peer relations and/or in an environment where discrimination or stigma is attached to a way of being, such a child may in a social-sense be left behind. I suspect parallels exist in relation to many who've borne the brunt of abuse and neglect legacies for in a sense we're 'late out of the gate', but this doesn't mean we'll not find someone - and the right someone at that.
For being especially mindful of past legacies (perhaps stretching across generations and further embodied by siblings, etc.) there (against odds even) exists the chance that qualities present within a loving relation established may possess good qualities that others no so touched cannot recognize and will not strike. 'Normal people' with 'normal histories' enter into poor relationships to live compromised lives; i.e. there is no guarantee of success regardless. Nevertheless, bring the best aspects of assertive and positive you when that certain someone is met.
Know all the while that the person across the way is in all likelihood also anxious, conflicted, consistent and then not so very much, and most of all - imperfect. As you stress about what he or she might be thinking, be open to the possibility that this other person may to be in a state consistent with not desiring to let you down. Each of you are trying to put forth what one hopes will be winning aspect of self, whereas a date is an experiment of sorts to gently establish if compatibility (not to discount the wonder of attraction to say little of heat by golly) exists. I would be inhuman not to feel anxious, while to feel anxious is register a most human emotional response consistent with desiring a positive outcome. Be kind to yourself...
M.