How can I improve my internal confidence?

I'm not going to go into too much detail but I'm insecure about my personality. It's been like this for a while. I feel weird for being "perceived" as mature. Reading and so goal driven. I have some friends and they're good friends but I still don't feel like I'm enough. I don't like opening up too much or showing a lot of my real character because I'll know I'll be judged. This is hurting myself and I just want to get over it. 😅
How can I improve my internal confidence?
Post Opinion