Hello, I'm 21 and I feel like life has been draining my

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Hello, I'm 21 and I feel like life has been draining my confidence, before my mom kicked me out of the house I was super confident, not afraid of anyone's opinions and very open about talking to new people, I used to not care about doing silly things in public and I rarely thought of the negative aspect of an interaction. My mom kicked me out when I was 18, when I was homeless I would always wear a hood so people from high school wouldn't recognize me, it was very hard for me to reach out to friends for help. My see life went down the toilet because I lost all confidence and self respect. I didn't even realize how far I had fallen until recently when I got a job at the mall and found that I had to push myself really hard to talk to new people. There is a woman who works at a kiosk next to mine and I can't even say hi to her, does anyone know of good ways to teach yourself how to be confident again?