you could start with the fear of dealing with ppl irl, ygrec. you mentioned that in your quote.

in the next quote it deals with an effective technique for us to deal with those feelings as they surface cause they can be overwhelming.
and yes, your therapist can work with you on your unknown fears/feelings to get them to the surface of your consciousness. to me feelings are not facts. but we can block that info of feeling to protect ourselves nevertheless, imo. some feelings are distorted/false beliefs. like ptsd. with these with your T's help you will learn new tools to discard them and replace them with real beliefs, i.e. your mother and you fearing others as well. like your way of coping all this time has been to distance yourself from others. however that was out of fear-a feeling. and false belief.
and "working through" to me is a process. some challenges i find are easier than others to resolve. a lot of it for me in therapy had to be dealt with slowly cause it was so painful/feelings. it seemed like i was reliving the events and i was. i know you are excited about this revelation you've discovered but it is just the beginning of your journey. don't allow what i've said to stop you-know you are eager-but your T will help you move at the pace that is best for you.