Hi Josie,
Well girl, it sounds like you had a successful outing as yourself. Why let your thoughts that you are thinking your cousin is reacting to you interfere with the success of how you know others actually feel? You are worrying about things you do not know for sure and hey, when it comes down to it if your cousins chooses to be indifferent to you, that would be his issue and not yours. The same would actually be true of the acceptance you think the other ladies have towards you. It does no good either way. it become relevant when you actually know how someone feels.
As far as what you described goes I would call it a success and stop fretting about it.
Hugs,
Jeanette