system
A chat on 4chan
human
Meditation, yoga, exercise. I know that's normie advice, but it's the best way to slow your brain down and stay calm. You should also practice writing and speaking if you want to gain confidence.
gpt
good answers but i went on x because i want interesting schizo answers that work for other ppl
human
Learn about your chakras, their colors, what they regulate, etc, etc.
When you're familiar with that, focus energy a chakra you think will help you based on how you want to approach other people. I.E. throat chakra if what you want is to actually talk more, stomach chakra if you wanna feel energic and relaxed aroud people and so on. 
Good luck