How do I stop feeling like I'm not worthy of this relationship?

lilyanony1
I've dated a few guys but I've never gotten to the point where I have met their parents and family. Actually tell a lie one guy introduced me to his sister and her children. But due to our cultural differences I think he wanted to be sure we were a sure thing before he got his family so mixed up.
Anyways I've met a guy that I'm really happy with, and he is totally besotted with me. We've met each others parents after 6 months and we are meeting extended families and starting to do joint birthday things which is nice. When I spend time with his family I start to get anxious and worry that I'm going to mess things up.
My longest and most traumatic relationship had me feeling like I was so inept. That I couldn't keep my sex drive in check, would hump anything with a pulse, that I couldn't make clear and effective decisions, that I was lazy and just not wife material. Consequently despite therapy it's coming back to haunt me as this new guy talks more and more about marriage.
I think initially as happy as I was I went along with it as its something I want but I'm so used to things ended that I kind of was just like yeah, OK great... But now im panicking because past experiences even in my own family I've been rejected so much and left out.
I feel really vulnerable. I don't really know how to say this to my partner not without him sort of saying I'm overthinking things. And it's not because he is insensitive but because he thinks I'm just worrying unnecessarily and putting the stress on me.
But this is a feeling I've become to used to. Feeling like the person on the outside looking in on the ideal family, friendship group etc and not being included.

Even when his mum was asking about my family, I wasn't embarrassed that I'm one of 6 and only know 1 sister, it was more that I felt sad to not be able to say that my sister and I are close despite everything. Life feels a bit jaded to me.
I feel like I should keep my dark cloud away from normal people.
How do I stop feeling like I'm not worthy of this relationship?
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