I'm not sure I know who I am anymore and while others think they know me, they really don't.
Has something changed about you?
I used to believe that people can do anything if they work on it, and I didn't care on what other people think
It is understandable when you change you become not sure about who you are anymore but you can learn about yourself again. There are professionals who can help you understand yourself more.
I read the bible and got baptized. That's what I'm doing right now.
People can find comfort in faith and if you're feeling unsure about yourself perhaps you can talk to someone at your place of worship. Most churches have staff who are there to help you in times of personal need.