Hello! I have to be honest that is actually one of the biggest areas where I as a consultant add value for my clients because I'm able to frame their experiences in a way where I can see what's common, to understand their "brand". It's difficult but if you're not able to work with someone I would recommend that you find the most insightful best listener in your group of friends, then start with describing your experiences from your resume. Talk about the stories of what you're proud of, just really have a dialogue with them about it. Because it captures many areas of your life when you flesh things out for that person, they might start to see some similarities.
At the same time I highly recommend that you do 360 reach, it is survey that you send out to many different people from childhood friends to dotted line supervisors. It's free for 15 days and the results you get back might help put some things together, it's also kind of fun.
My last recommendation would be to query *what are my values* it's a Mind Tools exercise.
https://MBAPrepCoach.com _________________