I need tips on how to find myself…

Seriously, people say “just be yourself”, but I don’t even know who I am… Most days I’m not a confident person. I think I have social anxiety because it’s like I’m afraid of people. I can’t be around them for too long. My voice is not the same, I have problems speaking my mind. I care A LOT about what people think. I’m insecure and people can tell. It’s been like this for the past couple years… I was very secure and confident in myself, I knew my likes and dislikes, I had morals and values… I try every day to get back to that, but nothing works… Please, I need advice.