I'm 28. I had separation anxiety up until about 12. And the social anxiety began at a very young age, as long as I can remember to be honest.
The separation anxiety was probably because I hated my mom leaving me alone with the rest of my family, as well as being afraid of people in general, and something bad possibly happening to my mom. My dick of a brother constantly bullied me, and my grandmother molested me at 13. It was after this event that it seems I transferred that separation anxiety to the fear of abandonment in my romantic relationships.
The separation anxiety was probably because I hated my mom leaving me alone with the rest of my family, as well as being afraid of people in general, and something bad possibly happening to my mom. My dick of a brother constantly bullied me, and my grandmother molested me at 13. It was after this event that it seems I transferred that separation anxiety to the fear of abandonment in my romantic relationships.