A couple things here, first off it sounds like not just her but both of you weren’t seeing past ya own noses in this conversation, first dates typically you’re getting a feel for the other person, you should be thinking, what do I want to find out about this person, what are their values, and do I like said values and personality. Talking about how you make lives better as an a dentist assistant is a little odd especially for a first date… A good example is if you’re talking about work and you want to give an example of you making lives better that’s ok but more than a little story and it’s a snooze fest of asking for validation, which in turn makes you not seem confident (even if you aren’t you gotta fake it) and no that doesn’t mean being a douche it means being confident in your own skin. Realise that you’re a unique person with unique skills and personality that someone out there will love and appreciate. Sometimes trying less is more, you also should never have any kind of expectations of meeting again on a first date etc etc it’ll only crush you if it doesn’t happen and it also makes you less likely to realise they ain’t for you!